An electric compressor comprising: a compressor body constituting an air conditioner; a motor for driving the compressor body; and a control section for controlling the operation of the motor, wherein: during the time when the operation of the electric compressor is stopped, the control section automatically performs actuation load reducing processing for reducing a load at the time when the compressor body is actuated by the motor, in the actuation load reducing processing, the control section heats the compressor body, whereby a refrigerant liquefied on the outlet side of the compressor body is vaporized, the control section comprises a switching element for supplying an alternating current from a dc power source to each of three-phase coils of the motor to rotationally drive the motor, and characterized by the compressor body constituting an automotive air conditioner, whereby in the actuation load reducing processing, the alternating current is supplied from the switching element to only the single-phase coil of the three-phase coils of the motor, and by generating heat only in the single-phase coil, the refrigerant liquefied on the outlet side of the compressor body is vaporized. a compressor body constituting an air conditioner; a motor for driving the compressor body; and a control section for controlling the operation of the motor, wherein: during the time when the operation of the electric compressor is stopped, the control section automatically performs actuation load reducing processing for reducing a load at the time when the compressor body is actuated by the motor, in the actuation load reducing processing, the control section heats the compressor body, whereby a refrigerant liquefied on the outlet side of the compressor body is vaporized, the control section comprises a switching element for supplying an alternating current from a dc power source to each of three-phase coils of the motor to rotationally drive the motor, and characterized by the compressor body constituting an automotive air conditioner, whereby in the actuation load reducing processing, the alternating current is supplied from the switching element to only the single-phase coil of the three-phase coils of the motor, and by generating heat only in the single-phase coil, the refrigerant liquefied on the outlet side of the compressor body is vaporized. during the time when the operation of the electric compressor is stopped, the control section automatically performs actuation load reducing processing for reducing a load at the time when the compressor body is actuated by the motor, in the actuation load reducing processing, the control section heats the compressor body, whereby a refrigerant liquefied on the outlet side of the compressor body is vaporized, the control section comprises a switching element for supplying an alternating current from a dc power source to each of three-phase coils of the motor to rotationally drive the motor, and characterized by the compressor body constituting an automotive air conditioner, whereby in the actuation load reducing processing, the alternating current is supplied from the switching element to only the single-phase coil of the three-phase coils of the motor, and by generating heat only in the single-phase coil, the refrigerant liquefied on the outlet side of the compressor body is vaporized.