To eliminate danger of falling-off of a conveyed load caused by malfunction of a holding mechanism.

A push buttom switch 3 for confirming the existence of a conveyed load is provided in a claw 2a of a gripping part 2 of a suspended type overhead traveling conveying carriage for holding the conveyed load in the carriage. The switch 3 is arranged to be pushed down when the load is exists in the gripping part 2. The switch 3 is connected to an electric power surce circuit of an actuator for opening and closing the gripping part 2 of the carriage, and a supply of electric power to the actuator for opening and closing the gripping part 2 is blocked in a condition where the switch 3 is pushed down. The gripping part 2 is prevented thereby from being opened by malfunction in a condition where the gripping part 2 holds the conveyed load so as to prevent the load from falling off, even when abnormality is generated in a controller for controlling the opening and closing of the gripping part 2.