To provide a safety device of fall prevention stopper capable of preventing damage of a connection part and an actuator due to a load in a lock release direction inputted from an inhibition member.SOLUTION: A safety device prevents an incorrect operation of a fall prevention member which can move between an inhibition position which can inhibit the movement of a load and a retreat position which retreats from a movement range of the load, and it includes: an inhibition member capable of moving between a first position advancing in a movement path of the fall prevention member and coming into contact with the fall prevention member and a second position retreating from the movement path of the fall prevention member; energization means for energizing so that the inhibition member is located in the first position; an actuator part for driving the inhibition member; and a bendable connection member for connecting the actuator part and the inhibition member.SELECTED DRAWING: Figure 3
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