Abstract: This engine control device of a self-propelled working vehicle is an engine control device of a self-propelled working vehicle that includes a working machine hydraulic pump for driving a working machine, and includes a vehicle velocity detection section configured and arranged to detect a vehicle velocity and a traction force control section. The traction force control section is configured to reduce the traction force by limiting the maximum throttle amount when the vehicle velocity is less than or equal to predetermined velocity based on the result detected by the vehicle velocity detection section.