A reciprocating mechanism for a fishing reel includes a first rotating body, a second rotating body, a rotation transmission body, and a movable body. The first rotating body is configured to rotate in conjunction with a winding operation of a handle of the fishing reel. The second rotating body is arranged spaced apart from the first rotating body along a spool shaft direction in which a spool shaft of the fishing reel extends. The rotation transmission body is bridged between the first rotating body and the second rotating body, and is configured to transmit the rotation of the first rotating body to the second rotating body. The movable body is configured to engage the rotation transmission body, and is configured to reciprocate in the spool shaft direction accompanying an actuation of the rotation transmission body.