Onomichi Plant (OP)

Business activities

Production of tires for large construction vehicles, mining vehicles and industrial vehicles.

Total site area


Number of employees

390 (as of December 2021)


20 Higashi-Onomichi, Onomichi City, Hiroshima 722-0051, JAPAN

Contact for consultation and complaints

Plant Control Section
Tel: +81-848-46-4580
Fax: +81-848-46-4579

Message from the General Manager

Tadashi Miura

The Onomichi Plant is situated commanding a view of the Setouchi-Shimanami Kaido Expressway. It is a production plant that is dedicated exclusively to manufacturing tires for large construction vehicles, mining vehicles and industrial vehicles.

We conduct our activities with the aim of “becoming a company with world class technologies for protecting the environment,” as stated in Yokohama Rubber Environmental Policy, and based on “bright, happy and vigorous” activities and cherishing greetings and the “5S” activities. With regard to environmental matters, we have carried out the improvement of equipment, the reviewing of mechanisms, and repeated educational activities for the purpose of preventing a recurrence of any past environmental trouble. Such has also been carried out in order to realize a reduction of environmental risk, a reduction of greenhouse gas emissions and a reduction of industrial waste.

Meanwhile, in terms of contribution to the local community and communication activities, we have been taking into consideration the status of COVID-19, opening the "Dinosaur Park" on the plant premises to the public, accepting children, students, and guests for plant tours, participating in local cultural activities and events, and promoting the "Heisei no Mori" project in Otsuchi Town, Iwate Prefecture. We continue to actively participate in local cultural activities and events, and promote the creation of a " Forever Forest" in the town of Otsuchi, Iwate Prefecture. Furthermore, we commenced a biodiversity protection survey in 2013, and we have been continued our measures to maintain and improve biodiversity, both here on the plant premises and in the neighboring watercourses.

In the future as well, the Yokohama Rubber Onomichi Plant will be considerate of the global environment, and as we aim to be a business that is both loved by our region and contributes to society, we will strive to become a company that is trusted by the region.

Organizational Governance

We have formulated plant safety, environment and quality policies, and we make use of regular morning meetings etc. to ensure that employees have a thorough understanding of these policies. In our day-to-day operations, by carrying out our work according to carefully documented standard operating procedures, we are able to implement a management system that prevents improper working methods, and we also undertake ongoing improvement. Managerial staff undergo compliance-related training on a monthly basis, and we are working to enhance awareness of compliance-related issues among all employees.

Morning meeting

Morning meeting

TPM instruction

Human Rights

Respect for human rights

In order to create a pleasant workplace where employees can work cheerfully, happily and energetically, we conduct workplace education, covering a variety of areas including information management, workplace bullying and harassment prevention, etc., every month. The content of this training involves the management of information and other issues such as workplace bullying, etc. We also maintain close collaboration with the Corporate Compliance Department regarding compliance-related reports and consultations, and if a problem occurs, we will promptly respond to it.

Labor Practices

Occupational safety and health measures

The plant obtained Occupational Safety and Health Management System (OSHMS) certification and has continued its certification activities. 0 lost time injuries, 1 lost time injury, and 1 minor injury occurred in FY2021, but we took steps to prevent recurrence by revising work procedures and horizontally deploying the system with other sections. Moreover, by focused safety education activities, the revision of standard operating procedure (SOP) manuals through open work observations, individual education based on safe employee evaluation, the undertaking of one-on-one training between deputy work supervisors and workers, mutual advice, and daily “KYT” Hazard Prediction Training activities, we are working to heighten the consciousness of our employees with respect to safety.
We promote “safe employee” development as part of these activities, and award model employees with certification as “super safe employees”.
We have also begun implementing “safe employee” evaluation by process, to facilitate implementation of measures aimed at realizing improvements in relation to weaknesses at individual workplaces.

Onomichi Plant Safety and Health Policy Basic Policy

Based on the recognition that the safety and health of all workers is the foundation of corporate activities, we will work to prevent occupational accidents and create healthy and comfortable workplaces.

Action Guidelines
  1. We will educate all plant workers on the importance of safety and health, provide the necessary education and training, instill a safety-first mindset, and build a culture of safety to develop human resources capable of taking action to ensure safety.
  2. Reduce risks by prioritizing and systematically improving issues extracted from risk assessments and daily near-misses in terms of laws, regulations, safety, disaster prevention, and the workplace environment by breaking them down into personnel, equipment, and operations.
  3. We will improve the work environment in the workplace through education and activities so that 5S activities (Seiri, Seiton, Seiso, Seiketsu, and Shitsuke) can be practiced voluntarily.
  4. We will promote the creation of a comfortable work environment through the improvement of the work environment and mutual communication, and work to improve the mental and physical health of our employees.
  5. As a business involved in the automotive industry, we proactively engage in activities that contribute to the prevention of traffic accidents thus aim to achieve the distinction of recording zero harmful accidents.

Tadashi Miura
General Manager, Onomichi Plant

Education and training for employees.

Responses in case of disaster

Promotion of employment of people with disabilities

Four disabled persons work at the plant. The tasks they undertake include both office work and light duties. We are continuing with activities for the purpose of newly-hiring disabled persons again in fiscal 2022.

Work-life balance

In aiming to improve the work-life balance of our employees, we manage overtime and promote the use of at least five paid holidays per year.

The Environment

Yokohama Rubber operates an environmental management system that is completely integrated throughout the entire company and makes efforts toward reducing risks by risk identification, countermeasures and improvements in areas exposed to environmental risks, through environmental risk management, implements its operations in compliance with relevant laws and ordinances, including the Pollution Control Agreement between the Onomichi Plant, Hiroshima Prefecture and Onomichi City, and looks to reduce risks by spreading awareness of nonconformities and small incidents at other Yokohama Rubber facilities. We are also implementing improvements to achieve ongoing enhancement of environmental performance, including a reduction of industrial waste and reduction of GHG emissions by promotion of energy savings. As a result of a plan to increase our internal audit staff according to corporate policy so as to further strengthen the ISO 14001 management system, we currently have 92 internal audit staff registered. We will further increase the number of staff according to our plan.
As one of our environmental activities, we have participated in the "Green Curtain Contest" sponsored by Onomichi City, and have won consecutive awards and been inducted into the Hall of Fame.

Onomichi Plant Environmental Policy

In line with Yokohama Rubber’s management policy “Deal fairly with society and value harmony with the environment,” we strive to embody genuine consideration for the global environment, and to be a top-level business in terms of our contribution to the environment.

  1. The Onomichi Plant addresses measures in consideration of the environment in all of its activities under the leadership of top management, and it implements world-class environmental activities.
  2. The Onomichi Plant continues its education and enlightenment programs so that each one of its employees understands this Policy and acts accordingly.
  3. The Onomichi Plant has strengthened its Environmental Management System in order to become a plant trusted by local communities and it continues to advance management with a proactive stance in order to prevent environmental pollution and improve the environment, while aiming to reduce environmental risk to zero.
  4. The Onomichi Plant complies with related laws, regulations and agreements, etc. It promotes harmony with local communities, and works to make both a regional and social contribution.
  5. To achieve carbon neutrality, the Onomichi Plant will promote energy-saving activities. We will promote less use and reuse of resources to realize a recycling-oriented society.
  6. We will maintain the lush green Forests of Forever Forest on the site and contribute to the preservation of the biodiversity of the Seto Inland Sea.
  7. In order to realize the Environmental Policy, the Onomichi Plant shall implement effective environmental management coordinated with its efforts to safeguard the local environment.
  8. This Policy shall be published.

1-January 2022
Tadashi Miura
General Manager, Onomichi Plant

Environmental data

Reductions in greenhouse gas emissions

The plant’s major energy sources are electricity and the city gas which is used as boiler fuel. Of the energy used in fiscal 2021, electricity accounted for 54.8%, city gas for 44.8% and other fuel sources 0.4%.

Greenhouse gas emissions

In order to reduce environmental loads, we have made efforts toward reducing GHG emissions by reduction targets for GHG emissions (total amount). In fiscal 2021, our energy-saving activities progressed as planned.

  • The base year is defined as 1990 except for HFC, PFC and SF6, where the base year is 1995 as per the Kyoto Protocol.
  • Method of calculation of greenhouse gases (GHG): this is in compliance with the “Calculation and Reporting Manual for Greenhouse Gas Emissions” issued by the Ministry of the Environment and the Ministry of Economy, Trade and Industry.
    Note that GHG emissions associated with purchased power in FY2009 were calculated using the Table of Emission Coefficients by Power Company (Ministry of the Environment).

Effective use of resources / Reduction of waste

Waste output

The Onomichi Plant has maintained a recycling rate of 100%.

Water usage

The Onomichi Plant collects industrial water from the Numata River water system (river water) that flows in Hiroshima Prefecture.
Water is collected from the city waterworks of Onomichi City. We are working to reduce the amount of water use by circulating plant cooling water. Furthermore, we have implemented improvement measures by setting reduction targets.

Measures for discharge into water, air and soil

Data related to water contamination

Our plant mainly uses water from the Numata River water system in Hiroshima Prefecture.
We discharge rain water into a public body of water and life system water is discharged into the sewage system of Onomichi City. The water quality of discharges is managed by setting voluntary standard values.

Move the screen to the left or right to see the table information

Item Regulatory values Voluntary standard values FY2021 result
Average Maximum Minimum
pH More than 5–less than 9 5.4 or more–8.6 or less 7.4 7.6 7.2
BOD concentration (mg/l) Less than 600 Less than 315 30.1 83 5.2
SS concentration (mg/l) Less than 600 Less than 200 26.8 85 2
Plant and animal oil concentration (mg/l) 5 or less Less than 2.0 Less than 1 Less than 1 Less than 1
Mineral oil concentration (mg/l) 30 or less Less than 24.0 7.8 18 Less than 1
Air pollutants (NOx, SOx, soot and dust)

Sooty smoke is measured twice a year by each individual boiler in order to monitor emissions and the density of pollutants. As a result of switching the fuel of boilers to city gas, emissions of Sulfur oxides into the air are now minimal. Thus, the Pollution Control Agreement was amended in March 2013. As a result of this development, the measurement of SOx is no longer necessary.

Move the screen to the left or right to see the table information

Item NOx SOx
Amount of emission (t/year) 3
Facility Substance Regulatory values Voluntary standard values FY2021 result
Average Maximum Minimum
Onomichi Plant Boiler 1 NOx (ppm)
Soot and dust (g/m3N)
123 or less
0.011 or less
Less than 0.015
Less than 0.002
Less than 0.001
Onomichi Plant Boiler 2 NOx (ppm)
Soot and dust (g/m3N)
120 or less
0.05 or less
Less than 0.001
Less than 0.001
Less than 0.001
Soil contamination

In order to monitor the status of contamination of soil by specified hazardous substances, we voluntarily measure and monitor the constituents of groundwater once every few years.

Reporting on chemical substance management status (Pollutant Release and Transfer Register (PRTR) Law compliance)

The Onomichi Plant verifies whether secondary materials and auxiliary materials contain chemical substances subject to Safety Data Sheet (SDS) requirements, and in the case of substances where the amounts handled exceed the thresholds specified by the PRTR Law, annual reports are submitted to the national (or prefectural) authorities and safety impact assessment is performed.
Regarding the handling of substances pursuant to the PRTR Law, please refer to the Safety Evaluation Table of Domestic Production Bases.

Biodiversity conservation activities

For the protection of biodiversity, the regional event in June 2021 was cancelled due to the response to COVID-19.
We conducted conservation of the Fujii River near the factory, which flows into the Seto Inland Sea, and monitoring surveys and conservation activities for insects and birds on the factory premises, which were scheduled to be conducted three times a year but were reduced to once a year due to the voluntary restraint.

Monitoring activities within the grounds of the plant

Monitoring activities at the Fujii River Water Park

Fair Operating Practices

Communication with business partners

In collaboration with the Materials Procurement Department and Raw Materials Procurement Department, we collect opinions and requests from business partners and then respond to them sincerely. We also respond appropriately to questionnaires received from business partners.
Furthermore, we are constantly hosting plant tours both by manufacturers who purchase our products and sales agents. These tours give the visitors an opportunity to inspect the production frontlines and to confirm the quality of our products.

Consumer Issues

Responses to complaints

When defect information is received from the market, we analyze the usage conditions and the failed tire to determine the cause. The results of the analysis are reported to the customer via the department in charge. 78 analysis reports were submitted in fiscal year 2021. The majority of the failures were caused by usage conditions, but in cases where the failure was due to manufacturing or design factors, we promptly implement countermeasures to prevent recurrence.

Community Involvement and Development

Relationship with local societies

As a place of recreation for people in the region, we open the Dinosaur Park to the public every day, from 8:00 a.m. to 4:30 p.m. We have also installed a restroom exclusively for visitors (which can also handle visitors in wheelchairs). This allows visitors to the park to enjoy a more comfortable time.
In fiscal 2021, a total of 1,088 persons visited the Dinosaur Park.
We received one group for a plant tour.

The Dinosaur Park is open to the public

The Dinosaur Park is open to the public

Participation in local activities

We participate and cooperate in local festivals every year.

The festival was cancelled in 2021 due to COVID-19.

Cooperation in Onomichi Truck Festival (September)

Volunteer participation in preparing and clearing up after the Onomichi Lantern Festival (October)

Onomichi Lantern Festival (FY2018)

Blood donation activities by employees (Cancelled due to COVID-19)
Beautification activities around the plant (once a month) (91 participants)

Fujii River Evening

Fujii River no Yube – Evening event at Fujii riverside (FY2019)

Plant tour and workshop

We accept requests for plant tours from schools and companies from time to time.

Available days: Days when plant is in operation: from Monday to Friday
(Except for year end and New Year holidays, and consecutive holidays in May and August)
Hours: 9:00 a.m. to 3:00 p.m.
Contact: Onomichi Plant, Plant Control Section
Tel: +81-848-46-4580
A 30-minute walk from Higashi-Onomichi Station.