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, Nippon Life 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 Daiichi 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
〒542-0081
3-4-26 Minamisenba, Chuo-ku, Osaka-shi, Osaka Prefecture
THE PEAK SHINSAIBASHI 9th floor
Shikoku Sales Office
760-0017
1-6-1 Bancho, Takamatsu City, Kagawa Prefecture
Ryobi Takamatsu Building 11th floor
China 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 Anezakikaigan, 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 Anezakikaigan, 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