An image pickup apparatus for an endoscope includes an exterior member； an internal unit including an image pickup unit； a fixing frame formed of metal and including at least one fixing portion configured to retain the internal unit and to fix the internal unit to an inner surface of the exterior member； and a washer provided between the at least one fixing portion and a screw hole of the inner surface, the washer being formed of a member with a lower thermal conductivity than metal, wherein the at least one fixing portion of the retaining member is fixed to the fixing part of the exterior member by a fixing member via the heat insulating member, and the heat insulating member covers an outer circumference of the fixing member.
