Disclosed is a refrigerant compressor wherein a first layer (24) composed of a single layer of chromium, a second layer (25) composed of an alloy layer of chromium and tungsten carbide, a third layer (26) composed of an amorphous carbon layer containing at least one of tungsten and tungsten carbide, and a fourth layer (27) composed of an amorphous carbon layer containing carbon and hydrogen but not containing a metal are sequentially formed on the surface of a sliding member (13b) of a compression mechanism which is formed of a tool steel. In the second layer (25), the chromium content is higher on the first layer (24) side than the third layer (26) side, while the tungsten carbide content is higher on the third layer (26) side than the first layer (24) side. In the third layer (26), the tungsten content or tungsten carbide content is higher on the second layer (25) side than the fourth layer (27) side.