An endoscope includes: an imager that includes a lens and an image transmitter configured to capture an image of a subject； a distal end rigid member that is provided at a distal end part of an insertion portion to be inserted into the subject, the distal end rigid member including a treatment tool insertion path into which a treatment tool to give a given treatment on the subject is inserted, an imaging hole in which the imager is arranged and in which a proximal end side is open, and a groove including a butting face on an end face of the groove on a distal end side； and a butting member arranged in the imager and configured to be butted against the butting face of the groove.
