A resilient member is accommodated within a single support column, which connects a flange and a pump unit. The resilient member presses the pump unit in an axial direction toward a bottom part of a fuel tank through a holder member. The support column is formed in a polygonal tube shape and has a specific range in a part in the axial direction. A peripheral wall in the specific range is concave relative to corner parts of peripheral walls in an outside of the specific range so that a longitudinal groove having a groove bottom is provided to separate an inside and an outside of the support column. The holder member holding the pump unit is formed in a polygonal hole shape to be fitted with the peripheral walls. The holder member has a slide protrusion, which slidingly moves in the longitudinal groove in a state that the holder member is pushed into the longitudinal groove from the outside of the support column.