To provide a safety holder which can be attached to a safety switch for integration therewith, and of clogging up insertion ports for an actuator with one-touch control.

The safety switch 1 is constituted of a switch body 2 and the actuator 3. The switch body 2 is constructed of an operation head part and a switch part. The operation head part has actuator insertion ports 7, 8 provided therein. The safety holder 20 that prevents wrong insertion of the actuator 3 is mounted on the switch body 2, while having a base body 21 that includes holes H1 for mounting a locking member, and a movable body 22 movably mounted on the base body 21, which is movable across a first position that opens the actuator insertion ports and a second position that clogs up the actuator insertion ports while having holes H2 for mounting a locking member. If the movable body 22 reaches the second position by the moving operation thereof, a state where the holes H1 of the base body 21 for mounting the locking member and the holes H2 of the movable body 22 for mounting the locking member are brought to be overlapped is achieved.