A reciprocating device includes; a reciprocating component, a forward-backward position control mechanism that controls the reciprocating component in a forward-backward movement, and a restricting member that puts the reciprocating component in a restricted state in which the forward-backward movement is restricted. The reciprocating component is provided on the casing such that the reciprocating component moves forward or backward while rotating relative to the casing. The forward-backward position control mechanism includes; a casing-side member, and a reciprocating component-side member fitted with the reciprocating component such that the reciprocating component is rotatable relative to the reciprocating component-side member. The restricting member is movable between a restriction position where the reciprocating component is in the restricted state and a restriction-lift position where the restricted state is cleared. The restricting member located at the restriction position engages with the reciprocating component-side member to put the reciprocating component in the restricted state.