To solidly support a fuel filter on an attachment base against a discharge pressure of a fuel pump in a vehicular fuel supply unit.

The unit is provided with the attachment base 3 made of synthetic resin, the motor-driven fuel pump 10a attached to the attachment base 3, a discharge pipe 26 of the fuel pump 10a, and a fuel filter 20 for filtering the fuel discharged by the pump. In the vehicular fuel supply unit, a fuel outlet pipe 25 of the fuel filter 20 is inserted in an insertion recess 19 formed in the lower surface of the attachment base 3, and a metallic supporting plate 31 which locks the fuel outlet pipe 25 so as to prevent leaving of the pipe 25 from the insertion recess 19 is fixed to a metallic supporting shaft 21 implanted in the lower surface of the attachment base 3.