Abstract: There is provided a coating film applied onto structural members of automotive body, such as drive shaft, which coating film is formed by hardening of a coating composition comprising an epoxy resin powder coating material and at least either a polyolefin resin or a modified olefin resin containing a polar group. As the polyolefin resin or modified olefin resin containing a polar group, there can be selected those of 0.1 to 80 g/10 min melt index at 190° C. and ?100° to ?20° C. brittle temperature. In the coating composition, the ratio between epoxy resin powder coating material and polyolefin resin or modified olefin resin containing a polar group on a weight ratio basis is set for 1 to 70 : 99 to 30.