Full List of API Manufacturers in Japan (2025)

Ouchi Shinko Chemical Industrial Co Ltd.

Head Office:
7-4, Nihonbashi-kobuna-cho,
Chuo-ku, Tokyo map
Zip Code: 103-0024
Tel: 03-3662-6451
Fax: 03-3661-1762

Sukagawa Plant:
111, Shimojukumae,
Sukagawa-shi, Fukushima
Zip Code: 962-0806
Tel: 0248-73-2171
Fax: 0248-76-3027

Haramachi Plant:
1, Kitsunezawa, Kobama, Haramachi-ku,
Minamisoma-shi, Fukushima
Zip Code: 975-0043
Tel: 0244-22-2136
Fax: 0244-22-0344

Web: https://www.jp-noc.co.jp

Permachem Asia, Ltd.

HQ: 6th Fl., Imon Horidome Building, 1-10-11,
Nihombashi-Horidomecho, Chuo-ku,
Tokyo / 103-0012
Tel: 03-3663-8091
Fax: 03-3663-8005

Kikugawa Plant, Tokai Branch/API bulk for drug manufacturing:
1500-18, Misawa, Kikugawa-shi, Shizuoka 439-0023 
Tel: 0537-36-2175

R&D center/Quality Control, Quality Assurance, Synthesis, Chemical Research:
14-29, Torihama-cho, Kanazawa-ku,
Yokohama-shi, Kanagawa 236-0002 
Tel: 045-776-3444 
Fax: 045-776-3438  
Web: http://www.permachem.co.jp

Pfizer CentreOne

2 Gogochi, Taketoyo, Chita District,
Aichi 470-2341, Japan

Phone: +81 569-72-2111
https://www.pfizer.co.jp/

Resonac Corporation

Tokyo Shiodome Bldg., 1-9-1,
Higashi-Shimbashi, Minato-ku,
Tokyo 105-7325, Japan

Tel: 81-3-6263-8000
Fax: 81-3-6263-8001
https://www.resonac.com

Ryoto Fine Co

277-0861, Japan
1410 Takada, Kashiwa City, Chiba Prefecture

Tel: 04(7143) 5561
Fax: 04 (7146) 2592
https://www.ryo-to.co.jp

Sanwa Chemical Co Ltd.

〒254-0013
9-24-8, Tamura, Hiratsuka-city,
Kanagawa, Pref.

Tel: +81-463-55-3140
Fax: +81-463-54-0203
https://sanwa-chemical.co.jp

Sato Yakuhin Kogyo Co., Ltd.

9-2 Kannonji-cho, Kashihara-shi,
Nara Prefecture, 634-8567, Japan

Tel: 0744-28-0021
Fax: 0744-28-0030
https://www.sato-yakuhin.co.jp

SEIKAGAKU CORP

Marunouchi Center Building 10fl.
6-1, Marunouchi 1-chome, Chiyoda-ku
Tokyo 100-0005, Japan
Tel: (81) 3-5220-8950
Fax: (81) 3-5220-8951

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CMC Laboratory:
1253, Tateno 3-chome, Higashiyamato-shi
Tokyo 207-0021, Japan
Tel: (81) 42-563-5811
Fax: (81) 42-563-5848

Kurihama Plant:
3-1, Kurihama 9-chome, Yokosuka-shi
Kanagawa 239-0831, Japan
Tel: (81) 46-835-3311
Fax: (81) 46-834-1918

Takahagi Plant:
258-5, Aza-Matsukubo, Oaza-Akahama
Takahagi-shi, Ibaraki 318-0001, Japan
Tel: (81) 293-23-1181
Fax: (81) 293-23-7542

Web: https://www.seikagaku.co.jp

Sekisui Medical Co. Ltd.

Head Office:
Urban Net Nihonbashi 2-chome Building,
Nihonbashi 2-1-3, Chuo-ku,
Tokyo 103-0027 Japan
Tel: 03-3272-0671
Fax: 03-3278-8774

Iwate Plant: Matsuo 4-115, Hachimantai,
Iwate 028-7305 Japan
Tel: 0195-74-3161
Fax: 0195-74-3822

Tokuyama Plant: Kaiseicho 4560, Shunan-shi,
Yamaguchi 746-0006 Japan
Tel: 0834-63-8841
Fax: 0834-63-0770

Tsukuba Plant: Koyodai 3-3-1, Ryugasaki,
Ibaraki 301-0852 Japan
Tel: 082-261-7862
Fax: 082-261-7863

Web: https://www.sekisuimedical.jp

Shiono Chemical Co., Ltd.

2-10-10 Yaesu, Chuo-ku, Tokyo 
Tel: 03-5202-0213 

Takasaki Factory:
1286-1 Kamiozuka, Fujioka City,
Gunma Prefecture  
Tel: 0274-24-2130
https://www.shiono.co.jp/

Shiono Finesse, Ltd.

HQ: 1-6, Dosyomachi 3-chome, Chuo-ku,
Osaka, 541-0045, Japan
Tel. 06-6222-1471
Fax. 06-6231-3160

Fukui Factory:
156-1 Aza-hamawari, Yonozu 49,
Mikuni-cho, Sakai, Fukui 913-0036, Japan
Tel. 0776-81-7555
Fax. 0776-81-6464
https://www.shiono-finesse.com

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Shionogi Pharma Co., Ltd.

224-20 Hiraishi Ebisuno, Kawauchi-cho,
Tokushima City, Tokushima 771-0132,
Japan

Tel: +81-88-665-2312
https://www.shionogi-ph.co.jp

Shiratori Pharmaceutical Co., Ltd.

HQ: WBG Marive East 28F,
2-6-1 Nakase, Mihama-ku,
Chiba-shi, Chiba
Tel: +81(43)307-8977
Fax: +81(43)299-8970

Chiba Plant:
54 Shinminato, Mihama-ku,
Chiba-shi, Chiba
Tel: +81(43)242-7631
Fax: +81(43)246-7473

Research and Development Center:
6-11-24 Tsudanuma,
Narashino-shi, Chiba
Tel: +81(47)452-3192
Fax: +81(47)452-3193

Akanehama Research Institute:
2-3-7 Akanehama, Narashino-shi, Chiba
Tel: +81(47)453-3168
Fax: +81(47)452-3158
https://shiratori-pharm.co.jp/

Solara Active Pharma Sciences Ltd

Japan 100-0004, Tokyo, Cyoudaku,
Otemachi, 1-5-1, First Square, 4F

Tel: +81 080 6803 8043
https://solara.co.in/

Spera Nexus, Inc.

Head Office:
4-8-2, Nihombashi Honcho, Chuo-ku,
Tokyo 103-0023 Japan

Tokyo office:
8F METLIFE Nihombashi Honcho Bldg. 1-1-1,
Nihombashi Honcho, Chuo-ku,
Tokyo 103-0023 Japan
Tel(main): +81 3 3279 0486
Sales: +81 3 3279 0545

Osaka office:
4-1, Doshomachi 1-Chome, Chuo-ku, Osaka-shi,
Osaka 541-0045 Japan
Tel: +81 6 6228 7601

Toyama Office:
9F Daido Life Toyama Bldg. 9-10, Honmachi,
Toyama-shi, Toyama 930-0029 Japan
Tel: +81 76 441 0735

North Cube:
29-5, Toshima 7-Chome, Kita-ku,
Tokyo 114-0003 Japan
Tel: +81 3 3913 6981

Shizuoka Plant:
1700 Hamagawa-shinden, Kakegawa,
Shizuoka 437-1423, Japan
Tel: +81 537 72 2200

Synthesis R & D Department:
1-15-11 Higashi-koujiya, Ota-ku,
Tokyo 144-0033, Japan
Tel: +81 3 3744 9922

Web: https://www.spera-nexus.co.jp/

Sumitomo Chemical Co. Ltd

5-33, Kitahama 4-chome, Chuo-ku,
Osaka 541-8550, Japan

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Tel: +81-6-6220-3428 
Fax: +81-6-6220-3416
https://www.sumitomo-chem.co.jp

Summit Pharmaceuticals International Corporation

1-2-2, Hitotsubashi, Chiyoda-ku,
Tokyo 100-0003
Tel: +81-(0)3-5220-1500 
Fax: +81-(0)3-5220-1501

Osaka Office: Sumitomo Main Bldg. 7F
4-5-33 Kitahama, Chuo-ku, Osaka City, Osaka 541-0041
Tel: +81-(0)6-6222-3971 
Fax: +81-(0)6-6222-6770

API Laboratory:
R&D D437 Kanagawa Science Park
3-2-1 Sakado, Takatsu-ku, Kawasaki City,
Kanagawa 213-0012
Tel: +81-(0)44-829-1170 
Fax: +81-(0)44-844-0371

Web: https://www.summitpharma.co.jp