About Us

Japan PI is a private investigation firm based in Japan.

Japan PI Inc. / 株式会社Japan PI
Company Number
90111-01-042541 (Incorporated in Japan)
2-6-20-#504 Kitashinjuku Shinjuku Tokyo 1690074 Japan
4-20-9-#204 Minamihorie, Nishi-ku, Osaka Osaka, 5500015, Japan
1888 Kalakaua Ave C312 HONOLULU HI 96815 USA
October 28, 2002
JPY 10 million

Goro KOYAMA 小山 悟郎

Contact Us
03-4496-4663 (+81-3-4496-4663)
PI Registration
Tokyo 30160155
Osaka 62161286
Osaka Governor Registration
Legal Adviser
Masako BANNO, Attorney at Law: Okuno & Partners

The Specified Commercial Transactions Act

Interested in working for Japan PI as a Private Investigator, please go to our Jobs Page.

About Goro KOYAMA

Goro Koyama

When I was in university, I seriously practiced full contact martial arts powerhouse in the college league. But as I was not an elite athlete, I broke my elbow and both knees.

While attending university, I had a strong interest in field works of researching on the hidden side of life or society and international matters including migration. In that course, I experienced a variety of fishy or illegitimate part time works. And the lure of doing fieldwork was too exciting for me. So I dropped out of college to pursue my passion in life, to become a Private Investigator where your main goal is uncover the hidden side or life or society.

I took a job at a local PI firm in Tokyo in 1992 and apprenticed as an investigator for 10 years, then founded my own agency in 2002.

I have never lost my curiosity in foreign matters and hidden facts of life since my childhood, so I am addicted to learn English by preventing myself from watching or reading Japanese other than work and look up online articles about untold stories or tools to uncover hidden facts.

What I do for a living now will be fitting with all my traits from my youth.

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