To provide a reciprocating mechanism capable of obtaining reliable operation with simple constitution.

This reciprocating mechanism is provided with a gear 10a and a worm 10b serving as first and second drivers constituting a driver 10 comprising a rotation body, and a slider 20 which is a driven body reciprocated by the rotation of the driver 10.The driven body 20 itself is provided with a first abutting part 21 abutting on the driver 10 to stop the rotation of the driver 10 when the driven body 20 comes to the driven motion starting end part, and a second abutting part 22 abutting on the driver 10 to stop the rotation of the driver 10 when the driven body 20 comes to the driven motion terminal end part.A power transmission part from the gear 10a to the worm 10b is provided with a torque limiter 10c.