A vehicle is provided, which includes an engine bay having an upper wall, side walls, a front wall, and a rear wall, an engine disposed inside the engine bay, and a dedicated heat retention member provided inside the engine bay, the dedicated heat retention member comprising an upper lid part covering the engine from above to be openable and closable, and side-wall parts covering a side of the engine. A portion of the side-wall parts is comprised of an engine mount bracket configured to support mounts of the engine, instead of the dedicated heat retention member.