An operation switching mechanism includes a wire 51, a reciprocating movement member 55, a first biasing member 53, a second biasing member 54, switching members 57 and 59 configured to switch states in which the first biasing member 53 and the second biasing member 54 perform biasing, and an operation member 52 configured to operate the switching members 57 and 59 according to operation from an outside and move the reciprocating movement member 55 to a first movement position or a second movement position P2.
