To provide a solenoid valve controller capable of restraining electric power consumption, miniaturizing a coil and restraining generation of noise due to pulsation.

PWM control circuits 203a, 203b to output driving pulse signals of a solenoid cutoff valve 108 to duty-control and a solenoid proportional valve 113 and smoothing capacitors 214a, 214b to smooth input signals are provided on the upstream side of a solenoid valve to be a load in control; the smoothing capacitors 214a, 214b are arranged between P channel power MOSFET 211a, 211b, clamp diodes 212a, 212b, direct current reactors 213a, 213b and the load; and an electric current to electrify the coil of the solenoid valve is controlled.