To efficiently transmit the rotation force of an impeller to a fuel smoothly flowing in a blade part and in a blade groove, and mold the impeller easily in a turbine type fuel pump with an impeller rotatably stored in a casing.

The rear surface 48 of each of plural blade parts 46 in the direction of rotation of the impeller 40 stored in a casing 21 to be rotated by a motor 15 has a pair of curved surfaces on both sides curved concavely so that the axially outer part 48a1 of the rear surface 48 is ahead of the axially inner part 48a2 in the rotational direction.