An endoscope includes: a distal end cover provided on a distal end of an insertion portion; a holding member fitted with the distal end cover and holding built-in components; a cylindrical member inserted into the distal end cover and the holding member, the cylindrical member having a groove portion formed on an outer circumference; an elastically deformable elastic member engageably inserted into the groove portion and fixing the cylindrical member to the distal end cover and the holding member; first accommodating portions formed at least on a surface of the holding member and accommodating the elastic member; and second accommodating portions communicating to the first accommodating portions and accommodating the elastic member which, at time of inserting and detaching the cylindrical member, comes out from the groove of the cylindrical member, comes into contact with the outer circumferential portion of the cylindrical member and bends by elastic deformation.