When forming valve seat coats at opening portions (16a 1 to 16a 8 ) of intake ports (16) provided at a cylinder block mounting surface (12a) of a semimanufactured cylinder head (3), the nozzle of a cold spray apparatus moves along a nozzle movement path for air intake (Inpl) that is set between any two of the plurality of opening portions (16a 1 to 16a 8 ), while continuing to spray a raw material powder. When forming valve seat coats at opening portions (17a 1 to 17a 8 ) of exhaust ports (17), the nozzle moves along a nozzle movement path for air exhaust (Enpl) that is set between any two of the plurality of opening portions (17a 1 to 17a 8 ), while continuing to spray the raw material powder.