To improve the vibration attenuation effect when attenuating vibration being transferred from a compressor for outdoor machine, for example, in an air-conditioning room, by cutting the middle of piping being extended from the compressor to a specific length and connecting both cut end parts by an elastic relay pipe.

In an outdoor machine for an air-conditioning room where piping 7a and 7b are connected to the discharge and suction sides of a compressor 6, a vibration attenuation device 10 is provided at the piping 7a and 7b. More specifically, a part close to the compressor 6 of the piping 7a and 7b is cut to a specific length L, both the end parts are fitted on both cutting end parts 11 and 12 for providing an elastic relay pipe 13, and the cutting end parts 11 and 12 are connected via the elastic relay pipe 13, thus composing the vibration attenuation device 10. A pedestal 15 that is sealed to the lower surface of a compressor body 6a is gear-locked to the bottom plate part of an enclosure by a gear-lock tool 14, and a vibration-proof cushion material 16 is included between a bottom plate part 1a and the pedestal 15, thus improving the attenuation effect of vibration due to the operation of the compressor 6.