Provided is a small-size and highly-effective apparatus test device by using a plurality of inverters and a common converter. The test device is used for testing an apparatus having N input shafts and M output shafts. The apparatus test device includes: a first motor (2) to an N-th motor (4) connected to the N input shafts; an N+1-th motor (5) to an N+M-th motor (7) connected to the M output shafts; a first inverter (8) to an N+M inverter (13) for converting DC power into AC power and controlling rpm or torque of the first motor to the N+M motor; and an apparatus control unit (14) which gives a torque instruction or a velocity instruction to the first inverter to the N+M inverter. The apparatus test device further includes a common converter (1) for converting the AC power into DC power for supply to the first inverter to the N+M inverter.
