The present invention provides a scroll type centrifugal compressor and a centrifugal compressor capable of restraining the energy loss of the pressure fluid discharged from the impeller and making it possible to increase the efficiency appropriately. Means for Solving the Problem The structure is designed to have a scroll portion which forms a spiral flow path through which pressure fluid A 'compressed by means of impeller rotation flows, and a discharge pipe part 10 which forms a pressure fluid supply flow path R2 which is connected to the spiral flow path and which conveys the pressure fluid A', the discharge pipe part 10 having a diameter expanding part 27 the diameter of which gradually increases from the input side 10b of the pressure fluid supply flow path R2 into which the pressure fluid A 'flows from the spiral flow path toward the output side 10c, and at the pressure fluid supply flow path R2 of the diameter expanding part 27, an inner cylinder 25a has, the inner part of which serves as a flow path with a small diameter R2 '.
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