How to Research the Japanese Market Using Japanese Sources

Much of the detailed information about Japanese markets is published in Japanese. Government statistics have English interfaces and summaries, and some reports are translated, but table notes, industry association data and most company commentary are often available only in Japanese.

This guide covers how to research a market or industry in Japan from public Japanese-language sources, and how to read the figures you find without misinterpreting them.

Define the market before looking for numbers

A “market size” means little until you know what it covers. Before you search, decide:

• Scope: which products or services are included and which are not
• Customers: consumers, businesses, public sector, or all
• Measure: sales value, shipment value, volume, number of users, or number of companies
• Geography: Japan as a whole, or specific regions
• Period: which year, and whether you need a trend over several years

Writing this down first lets you judge whether a figure you find actually answers your question, or only a related one.

Where market information is published in Japan

Government statistics

e-Stat is the portal for official statistics of Japan. It has an English interface, but many tables, category names and notes are in Japanese, and searching with Japanese terms tends to return more. Examples of major statistical surveys include the Economic Census (経済センサス), the Family Income and Expenditure Survey (家計調査) and the Current Survey of Commerce (商業動態統計). The survey that fits depends on your market; check each survey’s scope and definitions before using its numbers.

Statistics are usually published by the ministry responsible for the survey, and that ministry’s website often has explanations, past releases and methodological notes that e-Stat does not show in the same place.

Ministry reports and white papers

Ministries publish white papers (白書), commissioned survey reports and materials for advisory councils (審議会). These can give an overview of an industry, its regulatory context and its issues. Which ministry is relevant depends on the industry. Note the publication year: reports often stay online long after their data has been superseded.

Industry associations

Many Japanese industries have associations that publish statistics on production, shipments or sales among their members. These can be the most specific source available for a niche market. Check whether the figures cover the whole industry or only member companies, and whether some data is available only to members.

Company disclosures

Listed companies describe their markets and report results by business segment in their disclosures. This shows how major players see the market and how their business in it is changing — but it is each company’s view. For how to find these documents, see How to Research a Japanese Company Online.

Market research firms

Private research firms publish market size estimates and forecasts, often summarized in a press release while the full report is sold. The summary is useful, but check the firm’s definition of the market, the survey method, and whether the figure is an actual value or a forecast.

Reading Japanese figures correctly

Fiscal year and calendar year

年度 (nendo) means a fiscal or business year, not a calendar year. The Japanese government’s fiscal year runs from April to March, so a figure for 2024年度 generally covers April 2024 to March 2025. Company fiscal years vary; many end in March, but not all. A calendar year is written 年 or 暦年. Mixing the two shifts a figure by several months.

Older documents may use Japanese era years such as 平成 or 令和; convert them before comparing.

Units

Japanese tables commonly state units in a note above or below the table, and large numbers are grouped in units of 10,000 rather than 1,000.

A figure of 1,200 in a table headed 単位：億円 is ¥120 billion, not ¥1,200 million. Check the unit every time you copy a number.

Actual figures, forecasts and estimates

A single chart can mix actual figures for past years with forecasts for future years. Record which is which. Preliminary figures may later be revised, so note which release you used.

Why sources give different numbers

It is common to find several different figures for what looks like the same market. Before choosing one, check whether they differ in:

• Definition: which products or services are counted
• Measure: retail sales, shipment value, or revenue of providers
• Coverage: all companies, members of an association, or establishments above a certain size
• Period: fiscal year or calendar year, and which year
• Method: a census, a sample survey, or an estimate built from assumptions

If the difference still cannot be explained, record both figures with their sources and conditions. Choosing one without explanation hides the uncertainty from whoever uses your research.

Trace figures back to where they came from

News articles, blog posts and English summaries often quote a market figure without its conditions. Follow the citation back to the original report or table and confirm the figure, unit, period and definition there. The method is covered in Japanese Primary Sources: How to Trace Information to Its Origin.

When no market size is published

For many niche markets, no public figure exists. In that case you can:

• Report the closest available figures and explain how they differ from your definition
• Build an estimate from published components, stating every assumption and labeling the result clearly as your estimate
• Record that no public figure was found, and where you looked

What you should not do is present an unsourced number as a market size. Competitor-level information can also fill part of the gap; see How to Research Competitors and Pricing in Japan.

If you need Japanese market sources found and organized

Market research in Japanese sources takes time mainly because the material is scattered: statistics in one place, ministry reports in another, association data on its own site, and definitions and footnotes that must be read in Japanese before any figure can be used.

optimal plan SEARCH’s Japan Research Service researches Japanese-language websites and public sources on your behalf, verifies the findings, and delivers them as an English report with source links wherever possible. Anything we could not confirm is reported as not confirmed, rather than filled in with guesses.

You can describe your question in English. You don’t need to know the Japanese search terms or where to look.