To prevent a malfunction from being caused by the accumulation or fixation of contamination onto a less frequently used solenoid valve (electromagnetic valve for a specific operation).

A hydraulic work vehicle 1 is equipped with the solenoid valve 24 for switching of a working fluid of a hydraulic actuator, and a control part 110 for operating the solenoid valve. The vehicle 1 is also equipped with a first driving power supply circuit which supplies electric power to the control part and which makes the control part actuate the solenoid valve in accordance with signals from an operation means 25 and a detection means 26, and a second driving power supply circuit which operates the solenoid valve in accordance with a signal from an instruction means.