PURPOSE: To simplify the structure of a motor driven pump, to reduce the manufacturing costs and to increase the water resistance, mechanical strength, etc. of the pump, by molding a stator iron core and a stator winding in a watertight manner by a frame made of resin, and coupling the frame to a pump casing in a watertight manner.

CONSTITUTION: A circular coupling part 11a of a frame 11 made of resin that molds a stator iron core 2 and a stator winding 3 in a watertight manner is fitted to a coupling part 4a of a pump casing 4 by the intermediary of an O-ring 5. Thus, since the stator iron core 2 and the stator winding 3 are molded in a watertight manner by the frame 11 made of a resin and the frame 11 is coupled to the pump casing 4 in a watertight manner, it is enabled to simplify the structure of a pump.