PURPOSE: To enhance energy consumption efficiency by selecting either single operation or parallel operation of two compressor mechanisms in a rotary compressor in conformity with their respective load and improving the operation efficiency at said rotary compressor.

CONSTITUTION: A double cylinder type rotary compressor 1 is provided with an unillustrated motor section in the upper part of an enclosed case 2 and two rotary type compressor sections 30 and 40 in the lower part thereof, which are laid out in that fashion respectively. Each of solenoid type two way valves 51 and 52 are laid out respectively to each of suction pipelines 21 and 22 connected to each of suction ports 30a and 40a of each of the compressor sections 30 and 40, thereby selecting either single operation mode or parallel operation mode by each of the compressor sections 30 and 40. On the other hand, an outdoor heat exchanger 62 is connected to a discharge pipe 23 installed to the upper part of the enclosed case 2 by way of a four way valve 61 while an indoor heat exchanger 64 is further connected to the discharge pipe 23 by way of a decompressor respectively, thereby constituting a heat pump type freezing cycle. The drive power of the motor section is controlled in conformity with load by way of an inverter circuit unillustrated here-in.