Abstract: An image pickup unit includes: an image pickup optical system including an optical axis; an image pickup device; a first electric substrate on which the image pickup device is mounted; a second electric substrate formed integrally with the first electric substrate and configured to surround peripheries of the image pickup optical system and the image pickup device and extend in a direction along the optical axis, the second electric substrate including a housing space for housing the image pickup optical system and the image pickup device, a part of the second electric substrate being formed in an arc shape when viewed in a cross section in a vertical direction with respect to the optical axis; and a conductive circuit connecting the first and second electric substrates, and provided from a first surface exposed outside of the second electric substrate to a second surface in the housing space.

Abstract: An endoscope includes a fixed barrel non-turnably provided at a distal end portion of an insertion portion, an image pickup unit held to the fixed barrel, a movable barrel including a channel holding hole for holding a distal end of a treatment instrument channel inserted through the insertion portion, the movable barrel being supported by the fixed barrel so as to be turnable around an optical axis of the image pickup unit and being located closer to a distal end side than the fixed barrel, and a power transmission mechanism that transmits, to the movable barrel, power for causing the movable barrel to turn.

Abstract: An endoscope includes a fixed barrel non-turnably provided at a distal end portion of an insertion portion, an image pickup unit held to the fixed barrel, a movable barrel including a channel holding hole for holding a distal end of a treatment instrument channel inserted through the insertion portion, the movable barrel being supported by the fixed barrel so as to be turnable around an optical axis of the image pickup unit and being located closer to a distal end side than the fixed barrel, and a power transmission mechanism that transmits, to the movable barrel, power for causing the movable barrel to turn.