To provide a fuel pump case capable of securing prescribed seal action, and facilitating interference control.

In this fuel pump case 80, a flange part 104 is pressed through a seal member 99 toward a fuel tank, so that seal action is performed. An edge 105 of the flange part to compose the fuel pump case 80 is bent toward the fuel tank 42 to be a bent part 106. Height H of the bent part 106 is set to coincide with thickness of the seal member in such a way that the seal member 99 performs the prescribed seal action.