A cartridge vane pump includes: a linkage member being configured to link the side member and the cover member, the linkage member has: a first support portion configured to support the side member; a second support portion configured to support the cover member; and an extended portion formed so as to extend between the first support portion and the second support portion, the extended portion extending in an axial direction of the rotor, grooves are respectively formed in outer circumferential surfaces of the side member and the cover member so as to extend in a circumferential direction, and the first support portion and the second support portion are respectively received in the grooves formed in the side member and the cover member.