A vane pump 100 includes a rotor 2 that is rotationally driven; vanes 3 inserted into the rotor 2 in a freely slidable manner; pump chambers 6 that are defined between the vanes 3 at adjacent positions; suction ports 14 and 15 that guide working oil to the pump chambers 6; suction pressure chamber 13 that is communicated with the suction ports 14 and 15 and that stores the working oil; and a suction passage 12 that is connected to the suction pressure chamber 13 and that has an suction opening end 12a that opens at an outer surface of a pump body 10. In a state in which the vane pump 100 is mounted, the suction pressure chamber 13 is mounted below the suction opening end 12a of the suction passage 12.