Irradiating lighting light to the observation object region in order to observe the emission light which is given out from the observation object region of organism organization, incident direction L2 to the particular probe of the aforementioned emission light where the aforementioned image pickup device 9 is arranged on advanced side of the particular probe the emission light which is emitted from the observation object region in the probe which has the image pickup device which image pickup it does the surface picture of optical system and the observation object region which absorb light, vis-a-vis the aforementioned optical system 5,6,7,8, absorbs light extending the axis X which is present as a time driving axle in longitudinal direction of the particular probe, and direction of range of vision Y of the aforementioned image pickup device, the time driving axleLocking the relative angle around X, time motion it does. The optical element (mirror 8) and the aforementioned image pickup device (camera 9) which decide the incident direction to the particular probe of the aforementioned emission light which absorbs light being loaded by unit, the aforementioned phase opposite angle is locked.生体組織の観察対象部位から発せられる放射光を観察するために照射光を観察対象部位へ照射して観察対象部位から放射される放射光を受光する光学系と、観察対象部位の表面画像を撮像する撮像装置を備えるプローブにおいて、前記光学系5,6,7,8に対して、当該プローブの先端側に前記撮像装置9が配置され、当該プローブの長手方向に延在する軸Xを回動軸として、受光する前記放射光の当該プローブへの入射方向L2と前記撮像装置の視野Yの方向とを、回動軸X周りの相対角度を固定して回動する。受光する前記放射光の当該プローブへの入射方向を決定する光学素子(ミラー8)及び前記撮像装置(カメラ9)がユニットに搭載されて前記相対角は固定される。
