A fuel supply device is obtained in which joint strength can be maintained in a joint portion of plural filter members configuring a fuel filter. A fuel filter (16) with an overall bag shape is configured by welding together an upper face filter cloth (16U) a lower face filter cloth (16L) of the fuel filter (16) at a welded portion (16C). A sub tank upper side member (15U) and a sub tank lower side member (15L) nip the upper face filter cloth (16U) and the lower face filter cloth (16L) at a nipping position NP that is at a different position from the welded portion (16C).
