The present disclosure relates to an oil separator. The oil separator according to the present disclosure includes: a body having a space therein; a refrigerant discharge pipe connected to one side of the body, and discharging refrigerant which exists in the space; a supply pipe connected to the other side of the body, and sending refrigerant including ejected from a compressor to the space; and an oil discharge pipe connected to another side of the body, and discharging oil which exists in the space. The supply pipe includes a first inner supply pipe extended from a circumferential surface of the body to an inside having the space, and a second inner supply pipe disposed in the space, disposed to be spaced apart from the circumferential surface of the body, and having a form bent in a central direction of the body.