(EN) Provided are an endoscope device and a measurement support method capable of quickly measuring an observation object while preventing an increase in processing load. The endoscopic device (100) includes an imaging device (23) for imaging a subject through an imaging optical system including an objective lens (21) arranged at a tip portion (10C) of the endoscope (1), and an imaging device. A signal processing unit (42) that processes a captured image signal obtained by capturing an image of a subject by (23) and generates a captured image, and a planar measurement auxiliary light (30A) from the tip portion (10C) to the imaging optical system. It includes a measurement auxiliary light emitting part (30) which is emitted into the field of view (21A) of the system, and a crossing line (30f) which is formed at a portion where a plane (30F) formed by the measurement auxiliary light (30A) intersects the subject. A display control section (43) for displaying the captured image on the display section (7). The display control unit (43) displays a scale (70A) that is an index of the size of the subject on the intersection line (30f) included in the captured image.処理負荷の増大を防いで観察対象物の計測を素早く行うことを可能とする内視鏡装置及び計測支援方法を提供する。内視鏡装置（１００）は、内視鏡（１）の先端部（１０Ｃ）に配置された対物レンズ（２１）、を含む撮像光学系を通して被写体を撮像する撮像素子（２３）と、撮像素子（２３）により被写体を撮像して得られる撮像画像信号を処理して撮像画像を生成する信号処理部（４２）と、平面状の計測補助光（３０Ａ）を、先端部（１０Ｃ）から撮像光学系の視野（２１Ａ）内に出射する計測補助光出射部（３０）と、計測補助光（３０Ａ）によって形成される平面（３０Ｆ）が被写体と交わる部分に形成される交差ライン（３０ｆ）を含む撮像画像を表示部（７）に表示させる表示制御部（４３）と、を備える。表示制御部（４３）は、撮像画像に含まれる交差ライン（３０ｆ）上に、被写体の大きさの指標となる目盛（７０Ａ）を表示させる。
