Fluid machine and refrigeration cycle apparatus

A fluid machine comprising:

• a first compressor having a first closed casing, a first compression mechanism disposed in the first closed casing, an expansion mechanism disposed in the first closed casing in such a manner that the expansion mechanism is located below the first compression mechanism with respect to a vertical direction, and a shaft coupling the first compression mechanism to the expansion mechanism, the first closed casing having a first oil reservoir formed therein in such a manner that a surrounding space of the expansion mechanism is filled with a lubricating oil for the first compression mechanism and the expansion mechanism;
• a second compressor having a second closed casing and a second compression mechanism disposed in the second closed casing, the second closed casing having a second oil reservoir formed at a bottom portion thereof in such a manner that the lubricating oil for the second compression mechanism is held therein, and the second compression mechanism being connected in parallel to the first compression mechanism;
• and
• an oil passage having, on a side of the first closed casing, an opening located above the expansion mechanism with respect to the vertical direction, the oil passage connecting the first closed casing to the second closed casing so that the lubricating oil can flow between the first oil reservoir and the second oil reservoir.