To provide a fluid machine that can radiate heat without using lubricating oil and is easily maintained.

This fluid machine comprises a fluid mechanism part 2 having a roller 10 having a spiral groove 10g and rotating on an eccentric position in a cylinder 11 and a spiral blade 15 removably engaged with the spiral groove, and a motor part 4 having a motor 5 for rotating the roller of the fluid mechanism part with a rotating shaft 3. At least part of the outer surfaces of main and sub bearings 8 and 12 for bearing the cylinder 11 and the rotating shaft 3 is exposed to the outside.