An endoscope adapted to insert a treatment tool includes: an opening portion from which the treatment tool protrudes, the opening portion being provided on a distal end of the endoscope； a rotary shaft rotatably mounted in the opening portion, a direction of a shaft center being perpendicular to a longitudinal direction of the endoscope； and a raise base that is attachable to the rotary shaft and detachable from the rotary shaft in a predetermined attaching/detaching direction through the opening portion and is capable of rising around the rotary shaft while being attached to the rotary shaft.
