A traveling working vehicle maintains fuel economy while ensuring a sufficient work rate in heavy-load work A torque control regulator 26 controls the absorption torque of a hydraulic pump 22 to ensure that it does not exceed a preset maximum absorption torque, and an accelerator pedal 12 commands a target revolution speed of an engine 1. Revolution speed deviation computing sections 52 and 62, a modification torque computing section 53, a modification revolution speed computing section 63, speed ratio computing sections 54 and 64, traveling state determining sections 55 and 65, and working state determining sections 56 and 66 determine an operating state of the traveling working vehicle. Both the pump base torque of the hydraulic pump 22 and the target revolution speed of the engine 1 are modified depending on the determination result of the state determining sections.