To provide a guiding mechanism for smoothly and certainly guiding an operated object that is supported by a predetermined support base and moves along a predetermined track.

When guide projections 5a, 5b, and 6 move in guide grooves 3a and 3b to guide a motion of the operated object 2 to a predetermined track, a pair of small wall bodies 32 are separately stood at a predetermined interval. The guide grooves 3a and 3b are formed between the small wall bodies 32, and a basic surface having the projecting guide projections 5a, 5b, and 6 slides while linearly contacting with the tips of the small wall bodies 32 constituting the guide grooves 3a and 3b.