Abstract: A turbocharger comprising a center housing and a compressor housing. The compressor housing is fixed onto the center housing in such a way that the cylindrical inner wall of the compressor housing is fitted onto the cylindrical outer wall of the center housing. A single ring groove is formed on the cylindrical inner wall of the compressor housing. A snap ring and an O ring are fitted into the single ring groove for fixing the compressor housing onto the center housing while sealing therebetween.