ELECTRIC MOTOR UNIT WITH CONTROLLER

An object of the present invention is to provide an electric motor unit with a controller of a machinery and electricity integration type for eliminating variations due to mechanical factors and obtaining excellent operation reliability. A magnet member 8 is attached to a gear 13 on the side of a gear case 6, and a sensor 3 for sensing the magnet member 8 and detecting a rotational angle of the gear 13 in a controller case 56, and a cylindrical opening 57 concentric with the rotational center of the gear 13 is installed on the gear case 6, and a cylindrical part 58 fitting into the cylindrical opening 57 is installed on the controller case 56, and the controller case 56 is positioned and mounted on the gear case 6 by the fitting between the cylindrical part 58 and the cylindrical opening 57.