A fluid transport cartridge comprising: a first elastic tube that transports a first fluid; a second elastic tube that transports a second fluid; a third elastic tube that transports the first or the second fluid; a switching valve that selectively guides one of the first fluid and the second fluid to the third elastic tube; a plurality of pressing pins that are arranged along the third elastic tube in a transport direction of the fluid transported by the third elastic tube and that each move between a first position in which a transport path of the fluid transported by the third elastic tube is constricted by pressing on the third elastic tube from outside and a second position in which the transport path of the fluid transported by the third elastic tube is not constricted; a cam housing opening for housing a cam unit of a fluid transport driving unit for moving the pressing pins; and a mounted positioning portion that is shaped as an arc relative to a rotational center of the cam unit for fixing a position of the fluid transport cartridge relative to the fluid transport driving unit that includes the cam unit, wherein the plurality of pressing pins are arranged radially with respect to the rotational center of the cam unit to be housed in the cam housing opening, and wherein the fluid transport cartridge is fixed in a detachable manner to the fluid transport driving unit, such that the fluid transport cartridge can be attached to and detached from the fluid transport driving unit, characterized in that the mounted positioning portion is a through-hole for engaging with a convex portion that protrudes from an attachment surface of the fluid transport driving unit and has an arc shape with a circle of the arc being centered on a rotational center of the cam unit. a first elastic tube that transports a first fluid; a second elastic tube that transports a second fluid; a third elastic tube that transports the first or the second fluid; a switching valve that selectively guides one of the first fluid and the second fluid to the third elastic tube; a plurality of pressing pins that are arranged along the third elastic tube in a transport direction of the fluid transported by the third elastic tube and that each move between a first position in which a transport path of the fluid transported by the third elastic tube is constricted by pressing on the third elastic tube from outside and a second position in which the transport path of the fluid transported by the third elastic tube is not constricted; a cam housing opening for housing a cam unit of a fluid transport driving unit for moving the pressing pins; and a mounted positioning portion that is shaped as an arc relative to a rotational center of the cam unit for fixing a position of the fluid transport cartridge relative to the fluid transport driving unit that includes the cam unit, wherein the plurality of pressing pins are arranged radially with respect to the rotational center of the cam unit to be housed in the cam housing opening, and wherein the fluid transport cartridge is fixed in a detachable manner to the fluid transport driving unit, such that the fluid transport cartridge can be attached to and detached from the fluid transport driving unit, characterized in that the mounted positioning portion is a through-hole for engaging with a convex portion that protrudes from an attachment surface of the fluid transport driving unit and has an arc shape with a circle of the arc being centered on a rotational center of the cam unit.