Private Investigation in Japan
At Detective Agency Japan, we offer services to support applications for, and consultations with, investigative agencies in Japan via our website. Our services are designed for those who need private investigators to obtain information and gather evidence. If you are looking for a P.I. to conduct investigations on individuals or companies in Japan, perform counter-surveillance, or provide risk and business consultations, we encourage you to check us out. Payments can be made online using your credit card. Investigation reports can also be sent by email as PDF files.
Detective Agency Japan is one of Japan's leading investigation agencies, trusted by clients from all over the world. We specialize in various types of investigations, including private investigations, business-related surveys and consultations, and all kinds of evidence-gathering operations.
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Top-rated investigations in Japan
We are a reliable private investigation agency trusted by many lawyers.
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Reasonable fee
A deposit and guarantee refund system are available for international clients.
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Problems solving with our specialists
Our business alliance with a variety of professionals will support and guide you to solve problems.
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Private consultation in business fields
Business purpose requests for investigation and surveillance are also available.
If this is your first time hiring a private investigator, please feel free to ask us any
questions or share any concerns you may have.
Most importantly, Detective Agency
Japan is officially licensed and recognized by the Prefectural Public Safety Commission as one
of the most trusted investigation agencies in Japan. If this is your first time hiring a private
investigator, we are the best and most reliable choice to assist you.
Price Simulator Estimate Your Costs
One of the biggest concerns when hiring a detective is the "cost." Are you
wondering "how much will it actually cost?"
Use our Price Simulator to check the investigation
methods and fees suited to your specific needs for a smooth and transparent consultation!
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Our 5 missionsPROMISE
- We handle your cases personally and carefully.
- To understand your case properly, we might ask the behind story of your case. Our investigators are well experienced with handling your sensitive information, so your personal information will never be given to third-parties.
- We provide fee plan
within your budget. - We offer the best plan tailored to your case and budget. If you have any concerns about the cost, please feel free to ask.
- Our professionals support
your ideal future. - Our mission is to provide our clients with the information and support as they need. We dedicate our experience and professional expertise to helping you achieve the future you envision.
- We provide “keys” to pursue for solving your problems.
- The very first step in solving your problem is gathering background information about your case. Our investigators will support you in figuring it out through detailed conversations.
- Your satisfaction is guaranteed by our qualified services.
- Our investigators are well-trained and highly experienced in investigative techniques and problem-solving. We guarantee high-quality results.
Investigation flowSTEP 1 - 8
Pricing SystemPricing System
Turning uncertainty into peace of mind with clear and transparent costs
Fair and Transparent Pricing
It is natural to wonder: “How much will it actually cost to hire a private investigator?” Because the investigation industry often suffers from unclear pricing structures, we are committed to providing a transparent system that clients can trust. Every client’s situation and request is unique, which is why we strive to design the most suitable investigation plan at a fair and reasonable cost.
Three Reasons Clients Choose Us
1.Free Consultations and Estimates—As Many Times as Needed：We
listen carefully to your concerns and objectives, without ever applying pressure or engaging
in pushy sales tactics. Our specialized consultants explain the investigation details,
timeframes, and costs in clear terms, and provide written estimates. You are welcome to
consult with us as many times as necessary until you are fully satisfied.
2.No Hidden Fees—A Truly Transparent System：Once we present an estimate,
you will never be charged additional fees without your prior consent. All costs are
clarified and documented in the contract before the investigation begins.
3.Tailored Plans That Match Your Budget：Depending on your budget and
objectives, we provide several options for the most efficient and cost-effective plan. We
avoid unnecessary investigations, focusing only on collecting information that truly
matters—helping to keep costs under control while maximizing value.
Detective investigation serviceSERVICE
VOICEclient experience
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For your first calling usFOR BEGINNER
Please feel free to contact us if this is your first time hiring a private investigator in Japan.
We can support your first step in hiring a private investigator or other professional services in Japan.
If you have concerns about hiring a private investigator for the first time, we recommend starting with an initial consultation. We can discuss the average cost of an investigation, provide an estimate for your specific case, and even help determine whether a private investigation is truly the right solution for your problem. The most common concern when considering an investigation is the cost, but we offer a variety of plans tailored to your needs and budget.
The most reputable detective agency by lawyers in Japan
years of experience since we were established as the investigation division of a law office.
Our detective agency was established in 1998 as the investigation department of a law firm, and we have accumulated years of experience in this field. Fortunately, many lawyers continue to recommend our services to their clients. Currently, we receive over 8,000 inquiries annually, including referrals from local police departments and public offices. Through ongoing communication with our clients, we have consistently achieved high levels of client satisfaction. Whether the evidence we provide is favorable or unfavorable, our clients appreciate having clear, objective information that helps them make informed decisions. This sense of responsibility continues to motivate us every day and drives us to maintain the highest quality standards in our work.
Why you should choose us
Under our corporate philosophy, "Insatiable Inquiry," we are all deeply committed to helping clients solve their problems, no matter how difficult the situation may be. In addition, we approach every case with honesty and reliability. This is how we are able to fully understand our clients’ concerns and provide the best possible support.
Importance and Value of Private Investigators from a Lawyer’s Perspective
Attorney Imai (Member of the Second Tokyo Bar Association) shares the following insights based on his professional experience:
“In the course of my legal practice, I have often had to advise clients by saying, ‘I’m sorry, but in this case you will need to rely on a professional investigator.’ There are many instances in which evidence crucial to a case could not be obtained through legal channels alone, yet was successfully uncovered with the help of a private investigator. In litigation, both the quantity and credibility of information can decisively affect the outcome. For this reason, I consider investigative work by professional detectives to be not only valuable but indispensable in resolving disputes. That said, it is unfortunate that some investigative agencies operate in ways that I find inappropriate. Therefore, when seeking assistance, it is essential to ensure that the investigator is trustworthy and that the engagement—both in method and cost—provides real value.”
- Attorney-Collaborated Investigations; Coordinated investigations carried out in close cooperation with legal professionals.
- How to Find and Select a Trusted Detective Agency; Guidance for individuals and businesses to identify and choose reliable investigators.
- Corporate Investigation Services; Specialized investigation solutions tailored for corporate clients.
Join Our Global Partner Program GLOBAL PARTNER PROGRAM
Turn On-the-Ground Intelligence in Japan into a New Service Offering and Revenue Stream
An Official Referral Partnership Program for International Law Firms, Private Investigation Agencies, and Business Consultants
In today’s increasingly interconnected world, demand for investigations in Japan—including
corporate due diligence, fraud investigations, and asset tracing—is growing. However,
language barriers and Japan’s strict legal requirements, including the Detective Business
Act and the Act on the Protection of Personal Information, can make it extremely difficult
for overseas professionals to uncover the facts directly.
Tantei Hojin Chosashikai Inc. invites attorneys, licensed private investigation agencies,
and business consultants worldwide to join our Global Liaison Partner
Program. Refer your clients’ investigation needs in Japan to our team and
expand your service capabilities into the Japanese market. We handle the investigation
process locally, providing professional investigative support and reliable evidence to help
your clients make informed decisions.
Three Key Advantages of Partnering with Us
1. No Direct Contractual or Investigative Liability for Partners：Your
role is limited to conducting initial consultations with your clients and referring
their cases to us. All legally required explanations under Japan’s Detective Business
Act, service agreements, field investigations, and English-language reporting are
handled directly by our company. You do not assume contractual responsibility for our
investigative services or the associated operational risks.
2. Earn a 10% Referral Commission on Base Investigation Fees：For every
referred case that results in a signed investigation agreement, we pay a referral
commission equal to 10% of the base investigation fee, excluding tax. Depending on the
scale of the engagement, high-value cases involving corporate due diligence or asset
investigations can generate substantial referral income. Payments are made transparently
in USD or other agreed currencies via international bank transfer or services such as
Wise.
3. Nationwide Field Intelligence Backed by Experience Since
1998：Founded in 1998 and registered with the Tokyo Metropolitan Public
Safety Commission (Notification No. 30200224), we are an established Japanese
investigative firm with more than 8,000 consultations annually. Beyond desk-based online
research, our team conducts lawful surveillance, discreet observation, and field
inquiries throughout Japan, delivering compelling evidence and detailed reports to
support overseas legal proceedings and business negotiations.
Detective Agency Japan is officially registered, certified, and affiliated with the following Japanese government bodies, chambers of commerce, and public institutions.
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The Tokyo Chamber of Commerce and Industry (TCCI)
As an official regular corporate member, we maintain transparent management practices and strictly adhere to legal and regulatory compliance.
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TCCI B-mall (B2B Enterprise Network)
Registered with the B2B enterprise alliance network operated by the Chamber of Commerce, providing corporate due diligence and commercial risk mitigation across Japan.
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Mirasapo Plus (SME Agency / METI)
Registered with the national business portal operated by the Small and Medium Enterprise Agency (under the Ministry of Economy, Trade and Industry), committed to sustainable and sound corporate governance.
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Officially certified as Digital Promotion Committee Members, supporting digital transformation (DX) and resolving complex online defamation, cyber fraud, and digital disputes.
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Information-technology Promotion Agency (IPA)
Officially declared "SECURITY ACTION Two-Star" certified. We implement enterprise-grade information security protocols to safeguard all confidential client intelligence and investigative records.
Investigation requests
for all location in Japan acceptable
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Detective agency Japan
4-7-1 Jingumae 3F, Shibuya city, Tokyo, Japan ZIP 150-0001
Office open all year round, requests acceptable 24/7