To prevent the positional deviation of a light projecting element or light receiving element of an AF mechanism by shrinkage accompanying hardening of an adhesive in adhesion without using separate retaining members, such as leaf springs, with a camera having a frame bonded with the element described above in a prescribed position.

The retaining piece 42 which is capable of elastically thrusting and holding the element 41 in the prescribed position is disposed by molding integrally with the frame 34 and the element 41 is temporally stopped by the retaining piece 42 before the adhesive cures.