Patent ID: 8172409

Claim:
An image pickup apparatus comprising: an objective optical system including a first optical member disposed at a distal end position and a second optical member disposed on a proximal end side of the first optical member; an anti-fogging portion that prevents fogging of a surface of the first optical member; and an image pickup device; wherein: the anti-fogging portion includes a heating member that heats the first optical member, and a temperature measuring member that measures a temperature of the first optical member, in which the heating member is disposed on an outer circumference side of the second optical member and contacts against an inner surface on a proximal end side of the first optical member, and a proximal end side thereof is disposed further on a proximal end side than a surface on a distal end side of the second optical member, the heating member includes an electrical connection portion for heating and the temperature measuring member includes an electrical connection portion for measurement, and the electrical connection portion for heating and the electrical connection portion for measurement are disposed facing each other on a side on which the height of an effective light beam of the objective optical system is low.