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A statutory auditor (監査役, kansayaku^?) is an official found in Japanese kabushiki kaisha (business corporations).

Statutory auditors are elected by shareholders and hold a position in the hierarchy alongside the board of directors. A kabushiki kaisha must have at least one statutory auditor, unless the transfer of shares is restricted in the articles of incorporation. If the company is classified as a "large" company (i.e. with more than ¥500 million in paid-in capital or ¥20 billion in liabilities), it must have three statutory auditors, or an audit, compensation and nominating committee system similar to that used by public companies in the US.

Statutory auditors have several functions:

1. They initiate derivative suits against the board of directors on behalf of the shareholders, and represent the company in those suits. This right was once reserved for the auditor; however, following precedent from a recent lawsuit against Daiwa Bank, groups of shareholders can now file suits themselves without going through the auditor.
2. In "mid-size" and "large" companies (i.e. with more than ¥100 million of paid-in capital), they have the right to attend board meetings to monitor the directors' actions.
3. In "mid-size" companies, they audit the financial reports submitted by the company.
4. In "large" companies, they oversee auditing performed by outside certified public accountants. Not sure if this is correct

Statutory auditors are often selected from among the senior management of the company, or are former directors of related companies (such as suppliers or keiretsu partners).