Abstract: A temperature regulating material 31 for regulating a temperature of an exhaust manifold 11 is provided such that individual parts of the exhaust manifold 11 are uniformed in temperature. Heat transfer materials 31A with high thermal conductivity are layered as the temperature regulating material 31 on a cover member 25 at an area corresponding to a high-temperature area HT of the exhaust manifold 11. Heat shield materials 31B are layered as the temperature regulating material 31 on the cover member 25 at an area corresponding to the low-temperature area LT of the exhaust manifold 11. A heat dissipation material 31C as the temperature regulating material 31 coats an outer surface of the area of the cover member 25 corresponding to the high-temperature area of the exhaust manifold 11.