To secure the coaxiality of a pair of bearings supporting the output shaft of an electric motor, by decreasing cumulative manufacturing errors in an electric pump device.

The electric pump device is composed of: a pump P comprising a first pump housing half 1a and a second pump housing half 1b which define a pump chamber 5 between them, and an impeller 6 housed in the pump chamber 5; and an electric motor M, of which the output shaft 16 is connected to the impeller 6, attached to the second pump housing half 1b. A bearing support part 20 supporting a pair of bearings 23, 24 that support both ends of the output shaft 16 is integrally formed in the second pump housing half 1b.