A suspension device includes a fluid pressure circuit disposed between a damper, a pump, and a reservoir. The fluid pressure circuit includes an extension-side damping valve disposed in an extension-side passage, a contraction-side damping valve disposed in a contraction-side passage, and a suction passage that connects a discharge path to a supply passage at a point between an electromagnetic throttle switching valve and a supply-side check valve. The suspension device further includes a control unit configured to control the electromagnetic throttle switching valve on a basis of a differential pressure between the extension-side passage and the contraction-side passage.