Are you trying to locate someone in Japan who has gone off the grid? Whether you need to find a missing person, locate a debtor, or track down someone evading
Privin Network provides private investigation services in Japan, connecting clients with our investigators and local partners, experienced in background checks, surveillance, infidelity cases, corporate due diligence, and locating missing persons. Private investigation in Japan operates under a notification based regime set out in the Act on the Proper Operation of Detective Businesses, and every case is scoped with Japanese law in mind from the outset.
Our investigators and local partners cover Tokyo, the capital and Japan’s political and financial center, well suited to corporate due diligence and cases touching official records; Sasebo, home to U.S. Fleet Activities Sasebo and a shipbuilding industry, where much of the caseload is employment and background related; and Misawa, home to Misawa Air Base, a joint service installation, where much of the work involves personal and employment matters tied to its military and expatriate community. Wherever your case is based, our investigators and local partners know the area.
Our success is based on your success, and here are some of the many professional services our local Japan private investigator(s) can provide:
Personal Investigations
Not everyone is always who they say they are. Whether it’s an individual or a corporation, determine who they are and why they’re there.
Background Checks
Identify and confirm pertinent information about an individual for an important decision.
Surveillance
An organization or individual may find that they need surveillance help due to suspicious behavior or due to a situation or event that may have occurred.
International Investigations
If you have a business relationship or are contemplating a new business venture in a particular country, it’s not uncommon to need the services of a private investigator to verify good information about an individual or corporation.
Locate Investigations
With our investigative skills, we can help you gain addresses and phone numbers for locating individuals.
Cybercrimes and Digital Forensics
Equipped with the right technology and a highly skilled staff of professional investigative specialists, we can assist you in identifying a suspect, the purpose of an attack, and how it occurred. Japan’s Act on Prohibition of Unauthorized Computer Access criminalizes accessing a computer or network using another person’s ID or password without authorization, as the official Japanese Law Translation database sets out.
Infidelity and Adultery Marital Investigations
A marriage or relationship brings with it the expectations of monogamy, but many find themselves in situations where this expectation is not being met by one or both of the individuals involved.
Our trained and experienced Japan private investigators, staff, and management all have police and/or military background, Furthermore, they are well versed in local customs, culture, and society.
Under Article 770 of the Civil Code, adultery, known as futei koi, is one of several named grounds for judicial divorce, alongside malicious desertion and other grave causes that make continuing the marriage difficult, though the Civil Code also gives a court discretion to deny a divorce it considers unreasonable.
Japan ended more than a century of mandatory sole custody when a Civil Code amendment allowing joint custody after divorce took effect on April 1, 2026, letting separating parents choose joint or sole custody by agreement or leaving a family court to decide, as reporting on the reform explains.
The closest equivalent to a background check is the certificate of criminal record, issued by prefectural police on request, generally only to the person it concerns, mainly to satisfy a foreign government’s visa or immigration requirement rather than for routine domestic employment screening, as a prefectural police office describes.
Private investigation in Japan is regulated by the Act on the Proper Operation of Detective Businesses, which requires a business to file a notification with the prefectural Public Safety Commission before starting operations rather than apply for a discretionary license, and bars anyone with certain recent criminal convictions or organized crime group ties from filing one, as the Tokyo Metropolitan Police Department’s guidance sets out.
Personal data is governed by the Act on the Protection of Personal Information, overseen by the Personal Information Protection Commission, which gained expanded enforcement and fining powers under a 2026 amendment, according to the Commission’s own site.
Japan has no single dedicated law on recording consent. The Act on Communications Interception for Criminal Investigation authorizes wiretapping only by law enforcement investigating a narrow list of serious organized crimes, and courts have treated a participant recording their own conversation as lawful, while a third party secretly recording a conversation they are not part of can face separate privacy claims, as a summary of Japanese recording law explains.
I’ve had many interactions with Privin Network and all of them have been nothing but positive. Their Professionalism and knowledge is among the best in the industry.
Very easy to work with! Went above and beyond for me, exceeding expectations! Highly recommended.
After searching for my birth parent for 10+ years, I was finally able to be reunited. During the investigation I was updated along the way and not promised the outcome, but glad I made the choice to retain them.
Yes, all investigations are conducted discreetly and professionally, with respect to local regulation and privacy.
Yes, they handle cross-border and international investigations involving Japan.
Our investigators and local partners cover Tokyo, Sasebo, Misawa, and the surrounding areas, with access to local and regional networks to support investigations across the country.
You begin with a free consultation that outlines your needs and how the investigation team will proceed.
Private investigators must file a notification with the prefectural Public Safety Commission under the Act on the Proper Operation of Detective Businesses before operating, rather than hold a discretionary license, and our investigators and local partners work within that framework.
Yes. Japan’s Act on the Protection of Personal Information, overseen by the Personal Information Protection Commission, sets rules for handling personal data, and our investigators and local partners follow these requirements.
Japanese courts have generally treated a participant recording their own conversation as lawful, since no statute specifically bars it, though a third party secretly recording a conversation they are not part of can face separate privacy claims.
Adultery, known as futei koi, is one of several named grounds for judicial divorce under the Civil Code. Custody is decided separately, and as of April 2026 divorcing parents can choose joint custody rather than the sole custody that was previously mandatory.
The closest equivalent is the certificate of criminal record, issued by prefectural police mainly to satisfy a foreign government’s visa or immigration requirement, generally only to the person it concerns.
Japan’s Act on Prohibition of Unauthorized Computer Access criminalizes unauthorized access to computers and networks, and our digital forensic work is designed to operate within it.
The private investigators, staff, and management at our Japan office are highly skilled, with extensive police and military experience. Additionally, they have a strong understanding of the local culture and society.