An object is to provide a highly reliable vehicle-air-conditioner electric compressor of an inverter-integrated type that minimizes vibration and deformation of a board and a bus bar caused by vibration of a vehicle so as to prevent devices from becoming detached, to prevent soldered sections and welded sections from rupturing, and to prevent short circuits from occurring. In a vehicle-air-conditioner electric compressor (1) in which an inverter accommodating section (11) is provided at a periphery of a housing (2) and an inverter (20) is accommodated inside the inverter accommodating section (11), a control board (26) constituting the inverter (20) is screwed to fixing-screw base surfaces (29) provided at a plurality of locations of the inverter accommodating section (11), and a base (40) that has the same height as the fixing-screw base surfaces (29) and supports the control board (26) near substantially a midpoint of a fixing-screw pitch on the control board (26) and/or near a position where a large component is disposed on the control board (26) is provided at one or more locations of the inverter accommodating section (11).