To surely perform accurate lens driving amount confirming operation and to prevent a lens position detecting mechanism from getting complicated and large-sized by allowing a decision means to perform deciding operation only in one driving direction in the case of restoring a focusing lens to an initial position.

By reversely rotating a motor for focusing driving, the focusing lens is driven and reversely rotated to a standby position O and a standby position O' being a position after the lens passes through a reference position C. Therefore, by driving and reversely rotating the lens by a difference between the position O' previously known and a focusing target position S, the lens reaches the position O'. Continuously, the lens is driven and normally rotated toward the position C. When a reference position signal C is confirmed, the number of driving steps and the position S at that time are compared. If they match with each other, it is decided that the lens is normally driven, so that the lens is kept being driven and normally rotated further and it is driven to the position O, then driving is finished. Thus, the accurate lens driving amount confirming operation is surely performed.