An endoscope includes an image pick-up device at a distal end part of an insertion part capable of being inserted into a body cavity. The image pick-up device includes a lens barrel that holds an imaging lens； an image sensor having a rectangular shape as an outer peripheral shape of the image reception surface on which imaging light incident via the imaging lens； and a sensor holder that holds the image sensor in a state where the image reception surface intersects a longitudinal direction of the insertion part. The sensor holder has a fitting part fitted to the lens barrel, and an extending wall part that extends in the longitudinal direction of the insertion part from the fitting part to cover at least a portion of the outer peripheral surface of the image sensor, and the fitting part and the extending wall part are integrally configured.
