An engine control device for a working vehicle that comprises: a rotation speed control unit that controls a rotation speed of an engine according to an operation amount of an accelerator pedal; a hydraulic pump driven by the engine, that supplies a driving pressure to a working actuator upon which a reaction force according to a travel driving force is exerted; and a travel drive device that transmits a rotation of the engine to wheels through a torque converter, wherein the engine control device for a working vehicle comprises: a pedal operation amount detection unit that detects an operation amount of the accelerator pedal; a speed ratio detection unit (14, 15) that detects a speed ratio of an input shaft and an output shaft of the torque converter; a load pressure detection unit that detects a load pressure of the hydraulic pump; a speed stage detection unit that detects a low speed stage of a transmission capable of varying a speed stage between a low speed stage and a high speed stage; and a speed limiting unit that limits a maximum speed of the engine to a lower speed upon satisfaction of following speed limitation conditions being continued for a predetermined period of time: at least a pedal operation amount having been detected by the pedal operation amount detection unit is equal to or greater than a predetermined value, a speed ratio having been detected by the speed ratio detection unit is equal to or less than a predetermined value, a load pressure having been detected by the load pressure detection unit is equal to or greater than a predetermined value, and the low speed stage of the transmission has been detected by the speed stage detection unit, wherein the speed limiting unit reduces a limit value of a maximum speed of the engine over a course of time. a rotation speed control unit that controls a rotation speed of an engine according to an operation amount of an accelerator pedal; a hydraulic pump driven by the engine, that supplies a driving pressure to a working actuator upon which a reaction force according to a travel driving force is exerted; and a travel drive device that transmits a rotation of the engine to wheels through a torque converter, a pedal operation amount detection unit that detects an operation amount of the accelerator pedal; a speed ratio detection unit (14, 15) that detects a speed ratio of an input shaft and an output shaft of the torque converter; a load pressure detection unit that detects a load pressure of the hydraulic pump; a speed stage detection unit that detects a low speed stage of a transmission capable of varying a speed stage between a low speed stage and a high speed stage; and a speed limiting unit that limits a maximum speed of the engine to a lower speed upon satisfaction of following speed limitation conditions being continued for a predetermined period of time: at least a pedal operation amount having been detected by the pedal operation amount detection unit is equal to or greater than a predetermined value, a speed ratio having been detected by the speed ratio detection unit is equal to or less than a predetermined value, a load pressure having been detected by the load pressure detection unit is equal to or greater than a predetermined value, and the low speed stage of the transmission has been detected by the speed stage detection unit, wherein