In an arrangement structure for an air-conditioning compressor in a hybrid electric vehicle, an engine, a power generating motor, a driving motor, and an air-conditioning compressor are disposed in an engine room, the engine and the power generating motor being arranged in series, in which the air-conditioning compressor is arranged on a side portion of the power generating motor. The power generating motor and the driving motor are provided in parallel with each other in a vehicle longitudinal direction and are accommodated respectively in separate motor cases, and one of the motor cases on which the air-conditioning compressor is fixed is arranged at a position behind and higher than another one of the motor cases.