A jet pump is provided for supplying fuel from a fuel tank into a sub-tank, which is accommodated in the fuel tank. The jet pump includes a welded portion adapted to being welded to an outer wall surface of a bottom portion of the sub-tank. A swirl portion defines therein a swirl chamber. A jet nozzle generates negative pressure by jetting swirl-flowing fuel passing through the swirl chamber so as to draw fuel from the fuel tank into the sub-tank. A pressure-receiving portion defines a clearance with respect to the swirl portion. The pressure-receiving portion extends from the welded portion in a direction to distant from the sub-tank. The pressure-receiving portion is applied with force toward the welded portion when the welded portion is welded to the sub-tank.