Fluid machine

A fluid machine comprising:

• a bladed wheel rotated together with a rotary shaft;
• an electric motor including a motor rotor fixed to the rotary shaft, the electric motor being configured to rotate the rotary shaft;
• a resolver including a resolver rotor that has a cylindrical shape, the resolver being configured to sense a rotation angle of the motor rotor;
• a first fastener for fixing the resolver rotor to the rotary shaft;
• and
• a second fastener for fixing the bladed wheel to the rotary shaft, wherein
• the rotary shaft has a large-diameter portion and a small-diameter portion that has a diameter smaller than a diameter of the large-diameter portion,
• the resolver rotor is held between the first fastener and the rotary shaft and fixed to the large-diameter portion,
• the bladed wheel is held between the second fastener and the rotary shaft and fixed to the small-diameter portion, and
• while the resolver rotor is fixed by the first fastener in a same direction as the bladed wheel is fixed by the second fastener along an axial direction of the rotary shaft, and the resolver rotor is fixed by the first fastener at a position away in a radial direction of the rotary shaft from a position where the bladed wheel is fixed by the second fastener so that the resolver rotor does not receive an axial force from the second fastener.