Domestic/overseas bases

Domestic bases

Head office

Head office

100-8321
1-2-1 Otemachi, Chiyoda-ku, Tokyo
Phone number: 0120-132-015
FAX:0120-132-015 Reception hours: 9:30-17:00 (excluding Saturdays, Sundays, holidays, year-end and New Year holidays, and holidays designated by our company)

Branch offices

Hokkaido branch

〒060-0003
18th floor, Nihon Seimei Sapporo Building, 1-1 Kitasanjo Nishi 4-chome, Chuo-ku, Sapporo, Hokkaido

Tohoku Branch

〒980-0811
4-1-1 Ichibancho, Aoba-ku, Sendai, Miyagi Prefecture
Oak Tree Ichibancho 8th floor

Kanto First Branch

100-8321
1-2-1 Otemachi, Chiyoda-ku, Tokyo

Kanto Second Branch

100-8321
1-2-1 Otemachi, Chiyoda-ku, Tokyo

Chubu branch

〒450-0002
5th floor, Horiuchi Building, 3-25-9 Meieki, Nakamura-ku, Nagoya, Aichi Prefecture

Kansai branch

〒530-0001
2-2-22 Umeda, Kita-ku, Osaka City, Osaka Prefecture
HERBIS ENT Office Tower, 18th floor

Shikoku Sales Office

760-0017
1-6-1 Bancho, Takamatsu City, Kagawa Prefecture
Ryobi Takamatsu Building 11th floor

Chugoku branch

732-0053
12-1 Wakakusa-cho, Higashi-ku, Hiroshima City, Hiroshima Prefecture
AIC Hiroshima Office Building 10th floor

Kyushu branch

810-0001
6th floor, Tenjin Muto Building, 3-11-1 Tenjin, Chuo-ku, Fukuoka City, Fukuoka Prefecture

Refineries / Complexes / Technology & Engineering Center

Hokkaido Refinery

〒059-1392
25-1 Masago-cho, Tomakomai City, Hokkaido Prefecture
TEL:0144-56-0121

Chiba Complex

〒299-0192
2-1 Anesakikaigan, Ichihara City, Chiba Prefecture

Aichi Complex

〒478-8555
11 Minamihama-machi, Chita City, Aichi Prefecture
TEL:0562-55-1111

Tokuyama Complex

〒745-8613
1-1 Shingu-cho, Shunan City, Yamaguchi Prefecture
TEL:0834-21-1100

Technology & Engineering Center

〒261-7134
2-6-1 Nakase, Mihama-ku, Chiba City, Chiba Prefecture
World Business Garden Malibu East 34th floor

Laboratories/Development Center

Advanced Technology Research Laboratories

〒299-0293
1280 Kamiizumi, Sodegaura City, Chiba Prefecture
TEL:0438-75-2312

Performance Materials Laboratories

〒299-0193
1-1 Anesakikaigan, Ichihara City, Chiba Prefecture

Lubricants Research Laboratory

〒299-0107
24-4 Anesakikaigan, Ichihara City, Chiba Prefecture
TEL:0436-61-2502

Coal & Environment Research Laboratory

〒299-0267
3-1 Nakasode, Sodegaura City, Chiba Prefecture

Bitumen Department Technology Section

〒243-0303
4052-2 Aikawa-cho, Aiko-gun, Kanagawa Prefecture

Electronic Materials Development Center

〒299-0293
1280 Kamiizumi, Sodegaura City, Chiba Prefecture

Battery Material Development Center / Technology & Engineering Development Center

〒299-0293
1280 Kamiizumi, Sodegaura City, Chiba Prefecture

Overseas bases

Idemitsu Kosan Co., Ltd. Middle East Office

2404A, 24th Floor, Shining Tower, Al Khalidiya, Abu Dhabi, UAE (PO Box 3633)
TEL:+971-2-633-4740