NOVELTY - The compressor (101) has a case (10) including a pair of semi-cylindrical case portions (11, 12) made of resin and covering a refrigerant compression unit (2), and a set of mounting portions (17-19) mounted on a pair of attachment sections i.e. attachment bases (61, 62). The mounting portions have a set of tubular bodies (17a-19a) integrally provided with the case portions, and a set of bolts (51a-51c) inserted into the tubular bodies for mounting the tubular bodies to the attachment sections. The case portions are interposed among the compression unit and the tubular bodies.    USE - Motor-driven compressor i.e. refrigerant compressor, for mounting on attachment sections i.e. attachment bases, of an engine or travel electric motor installed in a vehicle e.g. fuel cell vehicle and electric automobile, and circulating refrigerant or fluid in a refrigeration device of an air conditioner of the vehicle. Can also be used for an air compressor of an air suspension apparatus of the vehicle or a pump for pumping hydrogen or air to a fuel cell stack in the fuel cell vehicle.    ADVANTAGE - The case portions cover a drive unit, so that the case portions can suppress emission of operational noise of a motor from a motor housing and reduce noise generated by the compressor. The compressor has a set of tubular cover portions for preventing compressive force created by the bolts to reduce the compressive force acting upon the tubular cover portions, thus reducing fatigue and creep induced in the tubular cover portions by the compressive force. The tubular bodies can be mounted to the attachment bases in a strengthened manner as fastening force of the bolts can be increased, where one of the tubular bodies is made of a metal and a compressor housing can be electrically connected to one of the attachment bases by a ground element and the tubular body by mounting the compressor such that an operation of leading out of a ground cable is unnecessary and the number of operations is reduced when the compressor is installed on the vehicle, thus reducing cost of the compressor.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of a case of a motor-driven compressor.    Refrigerant compression unit (2)    Case (10)    Semi-cylindrical case portions (11, 12)    Mounting portions (17-19)    Tubular bodies (17a-19a)    Bolts (51a-51c)    Attachment bases (61, 62)    Motor-driven compressor (101)