A driving force transmitting mechanism (1) for transmitting driving force from a driving source is configured so as to comprise linear or rod-like flexible operation wires (95 96) an inner pipe (2) which is a flexible guide member and through which the operation wires (95 96) are inserted and an outer pipe (3) which is provided on the outside radially of the inner pipe (2) and minimizes the deformation of the inner pipe (2).
