An engine-load control device for a working machine, in which an output of an engine whose speed is controlled by a speed instruction device is transmitted to driving wheels and also transmitted via variable displacement hydraulic pumps to hydraulic actuators including a hydraulic actuator for a working machine. The control device has engine speed detection means for detecting the speed of the engine, instruction-content detection means for detecting the content of an instruction by the speed instruction device, hydraulic-pump-load detection means for detecting a load on at least any one of load detection hydraulic pumps out of the variable displacement hydraulic pumps, and suction torque control means. The suction torque control means controls suction torque of at least one control hydraulic pump other than the load detection hydraulic pumps based on the result of detection by the engine speed detection means, the instruction-content detection means, and the hydraulic-pump-load detection means.