A distal end hood that is detachably mounted on a distal end portion of an endoscope includes a groove having a groove bottom portion formed in a ring shape over an entire circumference at a predetermined position on an outer peripheral surface of the distal end hood, a plurality of projections, which are provided on an inner peripheral surface on one side sandwiching the groove and in each of which a tapered surface is formed, the tapered surface reducing a wall thickness by continuously increasing a diameter of an inner peripheral surface from the groove side toward a distal end surface of the distal end hood, and a locking portion provided on a side opposite to the projections sandwiching the groove and locked to the distal end portion of the endoscope, in which the projections are configured to bend at the groove bottom portion toward a proximal end side.