To provide an air conditioner for preventing efficiency reduction when switching the operation number of compressors, by operating with high efficiency in a whole air-conditioning load area.

This refrigerant compression equipment has a prime mover 10 being a diving source, a plurality of compressors 11 and 12 driven by the prime mover 10, an interrupter 13 arranged on an input shaft of motive power to the compressors 11 and 12, and a power transmission mechanisms 17 and 21 transmitting rotational output of the prime mover 10 to the input shaft via the interrupter 13. The power transmission mechanisms 17 and 21 are composed of a continuously variable shift power transmitter 21 driving one compressor and a fixing ratio power transmitter 17 driving the other compressor.