Electric fluid pump and mold for insert-molding casing of electric fluid pump

An electric fluid pump, comprising:

• a casing made of resin;
• a rotor arranged in the casing;
• a shaft member supported by the resin casing and including a shaft portion extending in the casing in an axial direction of the shaft member, having a first end portion at one axial end of the shaft member and a second end portion at an opposite axial end of the shaft member, and supporting the rotor, a collar portion at the first end portion of the shaft portion having an outer diameter larger than an outer diameter of the shaft portion, the collar portion possessing a first axial end surface facing towards the first end portion of the shaft and a second axial end surface facing towards the second end portion of the shaft portion, the collar portion also possessing an outer circumferential surface, the collar portion being embedded in the resin casing so that the resin casing contacts the first axial end surface of the collar portion, the second axial end surface of the collar portion and the circumferential outer surface of the collar portion, and a stepped section positioned closer to the second end portion of the shaft portion than the collar section, the stepped section possessing an outer diameter smaller than the outer diameter of the collar portion and larger than the outer diameter of the shaft portion, the stepped section possessing an axial end surface which is a bearing surface on which the rotor is rotatably supported, wherein the casing includes a partial surface of an outer surface, the partial surface facing the first axial end surface of the collar portion and being spaced apart from the first axial end surface of the collar portion, the first end portion of the shaft portion includes an end surface facing the partial surface of the outer surface of the casing and being spaced apart from the partial surface of the outer surface of the casing, the end surface of the first end portion of the shaft portion contacts the resin forming the casing and contacting both the first axial end surface and the second axial end surface of the collar portion, and the bearing surface of the stepped section is coplanar with an inner surface of the casing and serves as a standard for positioning the shaft member relative to the casing.