An insertion section of the endoscope includes a cylindrical distal end base, and a hard member 212 having a small diameter portion 217 fitted into the distal end base, and secured to the distal end base with an adhesive applied on an outer surface of the small diameter portion 217. The small diameter portion 217 is provided with a housing portion 2174 extending inward from a leading end of the small diameter portion 217, a cut-out portion 2175 formed by cutting out a portion of the small diameter portion 217 from the leading end, and communicating inside and outside of the housing portion 2174 with each other, a dam portion 2171 extending in an axial direction of the insertion section along an outer surface of the small diameter portion 217, and blocking the adhesive flowing to the cut-out portion 2175, along the outer surface of the small diameter portion 217, and a storage portion 2172 continuously provided to the dam portion 2171, and partially storing the adhesive blocked by the dam portion 2171.
