The magnifying observation probe 1 includes an insertion portion 4 for connecting the distal end member 2 and the exterior tube 3 in succession, a distal end surface 2 f provided on the distal end member 2 and capable of coming into contact with the living mucous membrane, and a biological mucosa contacted by the distal end surface 2 f is observed an observation unit having an illumination window 13 and an observation window 15 is disposed on the outer peripheral surface of the distal end member 2, a plurality of divided pieces 6 on the proximal side of the ring 5a and the ring 5a projecting forward from the front end face 2f circumferential a holding unit 5 having expanded diameter portion 5b whose diameter increases in the outer diameter direction of the outer peripheral surface provided orient comprises.拡大観察プローブ1は、先端部材2及び外装チューブ3を連設する挿入部4と、先端部材2に設けられ生体粘膜に接触可能な先端面2fと、先端面2fが接触した生体粘膜を観察する照明窓13及び観察窓15を備えた観察部と、先端部材2の外周面上に配置され、先端面2fより前方に突出するリング5a及びリング5aより基端側に複数の分割片6を周方向に配列して設けて外周面の外径方向に拡径する拡径部5bを有する保持部5と、具備する。
