An endoscope includes: a tip portion main body provided at a tip portion of an insertion section a camera unit attachment hole provided so as to penetrate the tip portion main body a camera unit of which tip portion is fitted into a tip portion of the camera unit attachment hole a locking member disposed at an outer peripheral surface of the camera unit so as to be movable in a direction that is orthogonal to the axial direction a projection provided on either one of the locking member and the camera unit a sliding portion provided on the other one of the locking member and the camera unit and a locking biasing member configured to bias the locking member in the direction t orthogonal to the axial direction within the camera unit attachment hole and to push the locking member against the camera unit attachment hole.
