ROTATION SPEED DETECTION DEVICE

The purpose of the present invention is to provide a rotation speed detection device (12) which achieves improved detection accuracy regardless of a compressor (9) and the operating state of the compressor (9), and enables the prevention of the breakage of a detection unit (13). A rotation speed detection device (12) for a compressor (9), wherein a detection unit (13) for detecting full blades (11b) and splitter blades (11c) that are blades approaching a compressor casing (10) of the compressor (9) in response to a change in the inductance of a magnetic field is provided. The detection unit (13) is provided in an overlap region (C) in which the full blades (11b) and the splitter blades (11c) that are all blades can be detected and the exposure pressure is in the range of a gauge pressure of one atmosphere or less.