NOVELTY - The vehicle is provided with a battery (10) which is mounted in the luggage room of the vehicle. A battery group (21) is composed of two or more cells (30) by which an electric power generation element is accommodated inside a cylindrical-shaped case with electrolyte solution. A retainer board (22) is arranged for holding the cell from radial direction. The battery group is located in the area inside the edge of the retainer board, when viewed from the height direction (H) of the vehicle.    USE - Vehicle such as electric vehicle and hybrid vehicle e.g. motor vehicle.    ADVANTAGE - As the battery group is located in the area inside the edge of the retainer board, when viewed from the height direction view of the vehicle, impact is absorbed when the retainer board is elastically or plastically deformed. Hence the battery can be protected during vehicle collision and increase in number of components can be suppressed. As a positive electrode is located in upper side of the cell and the negative electrode is located in lower side of the cell, the permeation of electrolyte solution to the exterior of the case can be prevented, so that the service life of the each single battery can be increased. An exothermic board is attached in the state contacted with respect to the battery case, so that the heat of the battery group is thermally radiated by the battery case through the exothermic board and the temperature rise of the battery group can be suppressed effectively. As the retainer board is made of aluminum, copper, and iron metal, the heat conductivity of the retainer board can be increased, weight of the retainer board can be reduced and the manufacturing cost of the retainer board can be reduced. The temperature variation between the cells can be suppressed by providing heat exchange element e.g. Peltier device in cells.    DESCRIPTION OF DRAWING(S) - The drawing shows a top view of the battery.    Battery (10)    Battery group (21)    Retainer board (22)    Cells (30)    Height direction of vehicle (H)