Electric motor-driven compressor for vehicle

The present invention relates to a vehicle electric compressor. In the present invention, the rotating shaft 130, the rotor (112b) to be hot press-fit, the axis of rotation (130) of the outer diameter (R1) and the rotor (112b), the amount of interference (R1-R2, which is defined as the difference between the inner diameter (R2) of ) has a value greater than the (R1 × 0.01%). According to the present invention improves the product assemblability by properly setting the relationship between the outer diameter of the rotating shaft and the rotor bore while still has the advantage increasing the product reliability, so as to firmly hold the assembled state thereof.