An endoscope includes an insertion section configured to be inserted into a body cavity, a distal rigid section main body provided to a part on a distal direction side of the insertion section, and a functional section secured to the distal rigid section main body. The endoscope includes a first inner peripheral surface extending from a distal surface of the distal rigid section main body along longitudinal directions, and defining a first space in which the functional section is accommodated, and. a fragile portion which includes a first outer-peripheral exposed portion exposed on an outer peripheral of the distal rigid section main part body along the longitudinal directions, and which is extended from the first outer-peripheral exposed portion, toward the first inner peripheral surface. The fragile portion is more easy to break than any other part of the distal rigid section main body except for thereof.
