To provide a manufacturing method of an electric motor controller capable of forming a connector module comprising connectors different in shape without great change in design, and to provide the electric motor controller and a vehicle steering apparatus with the same.

When manufacturing the connector module for connecting a circuit board to a power source, terminal pieces 53 and 54 corresponding to the shape of a power source connector extending from the power source are first fixed to bus bar bodies 51 and 52 to form bus bars 31 and 32. Thereafter, while the terminal pieces 53 and 54 within an insert mold 61 are aligned using a connector punching mold 65 corresponding to the shape of the power source connector, a module holder is formed integrally with bus bars 31 to 33 by insert molding, thereby manufacturing the connector module.