To prevent a scroll compressor part or electrically driven motor part from being reversely rotated during operation stop.

This machinery is provided with a scroll compressor part 20 and a motor part 7 for driving this compressor part in a closed housing 1, a drive shaft 10 linking said compressor part 20 and motor part 7 is provided with a rotational disk 40 rotated in said closed housing 1, and this rotational disk 40 is provided with an inclined wing 41 immersed in a lubricating oil 37 which acts as a resistance during reverse rotation. According to such constitution, even when the scroll compression part 20 and the motor part 7 are attempted to be reversely rotated during operation stop, the inclined wing 41 of the rotational disk 40 provided at the drive shaft 10 receives the resistance of the lubricating oil 37 and suppresses the reverse rotation.