Abstract: A scaling device for weighing load applied on an elevator car floor to prevent overloading operated by detecting the amount of deformation of rubber insulators mounted under the car floor.Load detecting beams are provided under the car floor to detect the deformation of the rubber insulators, and each end of the load detecting beams is loosely jointed to an opposite side of the car floor.When the rubber insulators deform by the load applied on the floor, the load detecting means subside in conformity to the deformation of the rubber insulators and a load detecting switch mounted below the car floor is switched on by the subsidence of the load detecting beams as the load exceeds the rated load, thereby to stop the operation of the car.