To provide a hermetic scroll compressor for helium, preventing noise due to vibrations caused at an injection piping part by mixing of gas into an oil line.

In the hermetic scroll compressor for helium, an oil plate of a bottom chamber part is provided with notch portions forming small holes for a function of pressure balance between a motor chamber and an oil chamber and injection oil passages. With this, mixing of gas into the oil line can be prevented, vibrations and noise at the injection piping part as conventionally existing are prevented from increasing, and the hermetic scroll compressor for helium less in input dispersion and having high quality is obtained.