Centrifugal compressor

A centrifugal compressor comprising:

• a drive shaft extending along a first central axis and rotatable around the first central axis;
• a wheel gear rotating around the first central axis, together with the drive shaft;
• a driven shaft disposed parallel to the drive shaft, extending in an axial direction in which the first central axis extends, and rotatable around a second central axis;
• a pinion gear disposed to be rotatable around the second central axis, together with the driven shaft, and meshing with the wheel gear;
• an impeller that is disposed at a different position in the axial direction with respect to the pinion gear, and that configured to compress a working fluid by rotating around the second central axis, together with the driven shaft;
• a thrust collar disposed adjacent to the pinion gear in the axial direction, and restricting a displacement of the driven shaft in the axial direction by colliding with the wheel gear in the axial direction on an outer side in a radial direction, which around the second central axis, with respect to the driven shaft;
• and
• a plurality of bolts disposed at intervals in a circumferential direction, which around the second central axis, each extending in the axial direction, and fixing the thrust collar and the pinion gear,
• wherein each of the plurality of bolts fix the thrust collar and the pinion gear in a state where each of the plurality of bolts is inserted from a position opposite to the wheel gear with reference to the thrust collar in the axial direction.