[Problem] To provide a medical device capable of freely adjusting the curvature of the bend of a region connected to a distal end member provided with a medical treatment member. The medical treatment member provided on the distal end member enables observation, examination, or treatment in a more unrestricted range. [Solution] A medical device (21) has: a long body (30) having an opening (31) at the distal end a distal end member (40) held on the long body to be freely movable towards or away from the opening, said distal end member (40) being provided with a medical treatment member (50) and an operating member (60). The operating member includes a first member (61) connected to the distal end member, said first member (61) relaying power to relatively move the distal end member away from the long body, to the distal end member, and a second member (62) connected to the distal end member. Interaction between the first member and the second member make it possible to freely adjust the curvature of the first member.[Problème] Produire un dispositif médical capable dajuster librement la courbure de la flexion dune région racccordée à un composant dextrémité distale pourvu dun composant de traitement médical. Le composant de traitement médical disposé sur le composant dextrémité distale permet lobservation, lexamen, ou le traitement dans une plage moins restreinte. [Solution] La présente invention concerne un dispositif médical (21) qui comprend : un corps long (30) ayant une ouverture (31) à lextrémité distale un composant dextrémité distale (40) maintenu sur le corps long de manière à être librement déplaçable vers ou depuis louverture, ledit composant dextrémité distale (40) étant pourvu dun composant de traitement médical (50) et un composant opérationnel (60). Le composant opérationnel comprend un premier composant (61) raccordé au composant dextrémité distale, ledit premier composant (61) relayant une puissance pour déplacer relativement le composant dextrémit
