Reduce the invasiveness when inserting into the body of a patient, observe light of approximately the same wavelength as illumination light returning from the subject. An illumination light emitting part (2) which is inserted into the body of a patient and emits illumination light emitted from the light source part (3) in a spot shape toward a subject (A) in the body, (9) disposed in the body surface (C) of the patient and detecting reflected light from the scanning position of the subject (A) illuminated with the illumination light by the light scanning section (9) is detected by the light scanning section And a light detection section (4) for detecting light reflected by the light source.患者の体内に挿入する際の侵襲性を低減し、被写体から戻る、照明光と略同等波長の光を観察する。患者の体内に挿入されて、光源部(3)から発せられた照明光を体内の被写体(A)に向けてスポット状に射出する照明光射出部(2)と、照明光を被写体(A)上で走査させる光走査部(9)と、患者の体表(C)に配置されて、光走査部(9)により照明光が走査された被写体(A)の走査位置からの反射光を検出する光検出部(4)とを備える走査型内視鏡システム(1)を提供する。
