Corporate Information

Top Message

Becoming a company that
develops powder metallurgy technology
to bring innovation to the industry

Although times have changed since the establishment of the company in 1944, Diamet has consistently valued the policy of meeting customer requests to the maximum extent with sintered products manufactured through the powder metallurgical method. Fortunately, we built a trusted relationship with global manufacturers in the automobile industry for many years.

However, without being arrogant about our history and past achievements, Diamet continues to accept the challenge of entering new fields.

This is because developing powder metallurgical technology with the strength of high quality realizing high precision and overwhelmingly high productivity has the potential of achieving a revolution in industries where sintered products are not yet in use.

Diamet will contribute to the field of electric vehicles (EV) increasing in the automotive market share each year, as well as to fields other than the automotive field, such as natural energy power generation.

Diamet is not afraid of changing to keep up with changing times and needs. The company will continue to create new value that makes the world more prosperous while listening to customer voices and using various talents of our employees in all departments.

Diamet Corporation
Hiroshi Ii, President

Vision, Mission, and Value

Corporate PolicyCorporate Policy


Be the global industry leader with Powder metallurgy technology & products
Our manufacturing method of Powder metallurgy realize both high precision and production efficiency. This safe and secure technology also reduce damage to the environment compared with other metallic manufacturing techniques. We aim to be an industrial leader with our unique powder metallurgy products.


Be a reliable professional at all times
Diamet values the “Trust from our customers” as our first priority. As a powder metallurgy professional, we continue to challenge manufacturing products that surpass customer’s expectations, and share the delight with customers, employees, and local society.


Challenge of “Change”
We take on the challenge of revolutions and various possibilities in a think-outside-the-box manner.
Think “How?”
To support growing customer demands with more comprehensive solutions, we constantly think and move proactively.
Commit “Until the end”
We always keep the promise to our stakeholders. Even if it gets tough, we will follow through until the end.


Our activities contribute to the sustainable society and environment.

Toward the realization of a sustainable society, Diamet is committed to the environment and safety. By creating new value through the provision of products and services, we will contribute to the resolution of social issues represented by the SDGs.

Corporate Profile

Trade name
Diamet Corporation
Headquarters location
3-1-1 Kogane-cho, Higashi-ku, Niigata-shi, Niigata 950-8640 Japan
Tel: +81-25-275-0111 Fax: +81-25-275-7186
December 1, 2005
Shareholder composition
MEPRO HOLDINGS Co., Ltd.(100%)
Hiroshi Ii, President
Amount of stated capital
50 million yen
Net assets
Group:13,469Million yen
Parent Co.:14,435Million yen(March 2023)
Group:19,230Million yen
Parent Co.:16,875Million yen(March 2023)
Line of Business
Manufacture, research, development, and sales of sintered machine parts, oil-impregnated bearings, and other powder metallurgical products
Hiroshi Ii
Vice President
Takuhito Tsujita
Ryuzo Maeno
(Endeavour United Co., Ltd.)
Seiji Yamada
(Endeavor United Co., Ltd.)
Shuhei Narita
(Endeavor United Co., Ltd.)
Kohei Yanagi
(President of LeverN Co., Ltd.)
No. of employees
Group:1,303 Parent Co.:835(March 2023)
Fujioka Plant (Fujioka-shi, Gunma)
Higashi Nihon Office (Atsugi-shi, Kanagawa)
Chubu・Nishi-Nihon Office(Anjo-shi,Aichi)
Affiliate companies
PM Techno Corporation (Niigata-shi, Niigata)
Guangdong Diamet Powder Metallurgy Co., Ltd. (Foshan, China)
Diamet Klang (Malaysia) Sdn., Bhd. (Malaysia)


Established the Niigata Metals Plant of Mitsubishi Mining Company Ltd.
Started the production of oil-impregnated sintered bearings
Founded Mitsubishi Metal Mining Company Ltd. as a spin off from Mitsubishi Mining Company Ltd.
Opened the Second Factory (presently the headquarters plant)
The first plant burned down in the Niigata earthquake and was integrated into the second plant.
Changed the company name to Mitsubishi Metal Corp.
Exported the manufacturing technology of powder metallurgy.
Started operation of the Fujioka office (presently the Fujioka plant)
Started operation of Diamet Corporation (America)
Changed the company name to Mitsubishi Materials Corporation
Started operation of Diamet Klang (M) Sdn., Bhd. (Malaysia)
Started operation of Diamet Lingqing (Shanghai) Co., Ltd. (China)
Established Mitsubishi Materials PMG Co., Ltd. *1
Changed the company name to Diamet Corporation *2
Established Guangdong Diamet Powder Metallurgy Co., Ltd. (China)

*1 … Spun off the sintered part business from Mitsubishi Materials Corporation in December 2005.
Founded Mitsubishi Materials PMG Co., Ltd., through a joint investment with Mitsubishi Materials Corporation and Plansee Holdings AG.
*2 … Transferred the businesses of Diamet Corporation (America) and Diamet Lingqing (Shanghai) Co., Ltd., to PMG because of the termination of joint venture in December 2009.
Changed the company name to Diamet Corporation to be a 100% subsidiary of Mitsubishi Materials Corporation.

Office and Access


Headquarters and Niigata Office

3-1-1 Kogane-cho, Higashi-ku, Niigata-shi, Niigata 950-8640 Japan
Tel: +81-25-275-0111
Fax: +81-25-275-7186
About 10 minutes by car from the Takeo Interchange on National Route 7 toward the Niigata-shi East Ward Office along Prefectural Road 4 (Akamichi)
Fujioka Plant

Fujioka Plant

700 Ushita, Fujioka-shi, Gunma 375-0034 Japan (in Ushita Industrial Park)
Tel: +81-274-24-2751
Fax: +81-274-24-2753
About 17 minutes by car from the Fujioka Interchange on the Joshinetsu Expressway toward the Gunma Prefecture Fujioka Police Office.

Higashi Nihon Office

HONATSUGI MY-BUILD. 9F, 1-27-6 Asahi-cho, Atsugi-shi, Kanagawa 243-0014 Japan
Tel: +81-46-282-8080
Fax: +81-46-282-8081
About three minutes on foot from the South Exit of Honatsugi Station on the Odakyu Odawara Line.

Chubu・Nishi-Nihon Office

City Tower 5F, 1-15-10 Mikawaanjo Minami-machi, Anjo-shi, Aichi 446-0058 Japan
Tel: +81-566-70-8791
Fax: +81-566-70-8794
Access: 3 minutes on foot from the Mikawa Anjo Station on the Shinkansen Line.
5 minutes on foot from the Mikawa Anjo Station on the JR Tokaido Main Line.

Affiliate companies

PM Techno Corporation

PM Techno Corporation

14 Heiwa-cho, Higashi-ku, Niigata-shi, Niigata 950-0035 Japan
Tel: +81-25-275-1261
Fax: +81-25-275-5334
Guangdong Diamet Powder Metallurgy Co., Ltd.

Guangdong Diamet Powder Metallurgy Co., Ltd.

No. 6-1, Keyuan 3 Rd, XiaoHuangPu, Ronggui, Shunde District, Foshan, Guangdong Province, 528305 China
TEL: +86-757-2211-9470
FAX: +86-757-2211-0211
Diamet Klang (Malaysia) Sdn Bhd

Diamet Klang (Malaysia) Sdn Bhd

Lot 26, Leboh Sultan Mohamed 1
Bandar Sultan Suleiman, 42000 Port Klang
Selangor Darul Ehsan, Malaysia
TEL: +60-3-3176-4245
FAX: +60-3-3176-3129