An endoscope includes in an insertion portion thereof a hard distal end portion and a bending portion arranged consecutively with the distal end portion; with the center axes of the distal end portion and the bending portion kept eccentric with each other, the distal end portion and the bending portion are coupled. A distal-end constituent member includes a distal-end bending-portion joint piece arrangement stage, a transition portion, a distal-end formation portion, and the like. The distal-end formation portion defines the contour of the distal-end constituent member, and the center position is OA. The transition portion is the reference plane for the bending portion, and the center position is OB. A distal-end bending-portion joint piece incorporated in the bending portion is arranged on the distal-end bending-portion joint piece arrangement stage. The center positions of the distal-end formation portion and the transition portion are eccentric with each other.