The present invention relates to an oil filter, capable of improving filtering properties by improving adsorption efficiency of metallic foreign substances contained in oil without disturbing the flow of the oil by arranging a magnetic body on the outside of a housing. The magnetic body (100) includes a protective cover (200) which is a nonmagnetic body and is arranged on the outside of the magnetic body (100) to enclose the magnetic body (100) and a fixing unit fixing the protective cover to the outer circumference of the housing (30).
