The surgical treatment apparatus (100) includes an action unit (4) for treating the biological tissue (A), a light emitting unit (9) for irradiating the biological tissue (A) with detection light, and a light receiving unit for receiving scattered light of the detection light. Part (10), a labeling part (50) for labeling a position substantially the same as the irradiation position of the detection light of biological tissue (A), a light detection part (11) for detecting the intensity of the scattered light, and the intensity of the scattered light A frequency analysis unit (12) for extracting frequency information from the time-series data, a determination unit (13) for determining the presence or absence of a blood vessel (B) to be detected in the living tissue (A) based on the frequency information, and detection And a control unit (2) that operates the marker unit (50) when the target blood vessel (B) exists.外科処置装置（１００）は、生体組織（Ａ）を処置する作用部（４）と、生体組織（Ａ）に検出光を照射する発光部（９）と、検出光の散乱光を受光する受光部（１０）と、生体組織（Ａ）の検出光の照射位置と略同一位置を標識する標識部（５０）と、散乱光の強度を検出する光検出部（１１）と、散乱光の強度の時系列データから周波数情報を抽出する周波数解析部（１２）と、周波数情報に基づいて生体組織（Ａ）内の検出対象の血管（Ｂ）の有無を判定する判定部（１３）と、検出対象の血管（Ｂ）が存在するときに標識部（５０）を動作させる制御部（２）とを備える。
