Endoscope with a treatment instrument exchanging device

摘要

An endoscope (1) includes: a treatment instrument elevator base (23) including a contact surface (23a) which contacts with a treatment instrument inserted into a treatment instrument insertion channel (26), and rotatably provided to a distal end (15) to elevate the instrument; a contact portion (34) provided to the distal end to contact with the instrument when the elevator base is elevated; a first leading portion (23b) provided to the contact surface to lead the instrument to a predetermined position on the contact surface as the elevator base is rotated; a holding portion (23c) provided to the contact surface and the contact portion, and including a grasping surface for sandwiching the instrument with a diameter not exceeding a predetermined value; and a second leading portion (34b) provided to the contact portion to lead the instrument larger than the grasping surface away from the holding portion.