A control apparatus for working vehicle, comprising: a travel circuit that is formed through a closed circuit connection of a variable displacement hydraulic pump driven by an engine and a variable displacement hydraulic motor; a work circuit that comprises a work hydraulic pump that is driven by the engine and a work hydraulic actuator (114, 115) that operates by pressure oil from the work hydraulic pump; a relief device (12, 14) that relieves high pressure oil of at least one of the travel circuit and the work circuit; an operatingmember that instructs an engine rotation speed; a rotation speed control unit that controls the engine rotation speed in correspondence to an operation amount of the operating member; characterized in that a state detection unit that detects a vehicle state of high load travel and high load work; and a speed limitation unit that reduces an upper limit of engine rotation speed that is controlled by the rotation speed control unit when at least the vehicle state of high load travel and high load work is detected by the state detection unit, wherein: the state detection unit comprises: a travel circuit pressure detector that detects a load pressure (Pt) in the travel circuit; and a work circuit pressure detector that detects a load pressure (Pf)in the work circuit, and the state detection unit determines the vehicle state of high load travel and high load work when at least a travel circuit pressure (Pt) detected by the travel circuit pressure detector is equal to or greater than a set travel circuit pressure (Pts) and a work circuit pressure (Pf) detected by the work circuit pressure detector is equal to or greater than a set work circuit pressure (Pfs). a travel circuit that is formed through a closed circuit connection of a variable displacement hydraulic pump driven by an engine and a variable displacement hydraulic motor; a work circuit that comprises a work hydraulic pump that is driven by the engine and a work hydraulic actuator (114, 115) that operates by pressure oil from the work hydraulic pump; a relief device (12, 14) that relieves high pressure oil of at least one of the travel circuit and the work circuit; an operatingmember that instructs an engine rotation speed; a rotation speed control unit that controls the engine rotation speed in correspondence to an operation amount of the operating member; characterized in that a state detection unit that detects a vehicle state of high load travel and high load work; and a speed limitation unit that reduces an upper limit of engine rotation speed that is controlled by the rotation speed control unit when at least the vehicle state of high load travel and high load work is detected by the state detection unit, wherein: the state detection unit comprises: a travel circuit pressure detector that detects a load pressure (Pt) in the travel circuit; and a work circuit pressure detector that detects a load pressure (Pf)in the work circuit, and the state detection unit determines the vehicle state of high load travel and high load work when at least a travel circuit pressure (Pt) detected by the travel circuit pressure detector is equal to or greater than a set travel circuit pressure (Pts) and a work circuit pressure (Pf) detected by the work circuit pressure detector is equal to or greater than a set work circuit pressure (Pfs). the state detection unit comprises: a travel circuit pressure detector that detects a load pressure (Pt) in the travel circuit; and a work circuit pressure detector that detects a load pressure (Pf)in the work circuit, and a travel circuit pressure detector that detects a load pressure (Pt) in the travel circuit; and a work circuit pressure detector that detects a load pressure (Pf)in the work circuit, and the state detection unit determines the vehicle state of high load travel and high load work when at least a travel circuit pressure (Pt) detected by the travel circuit pressure detector is equal to or greater than a set travel circuit pressure (Pts) and a work circuit pressure (Pf) detected by the work circuit pressure detector is equal to or greater than a set work circuit pressure (Pfs).