NOVELTY - The battery holder (10) has a support unit (20) with battery holding holes (21S) for inserting each battery (Bt). A holder unit (30) supports the battery in support unit. The holder unit has first spacer (32) and second spacer (34) laminated between the battery and battery holding hole. The first spacer has support part that forms heat shielding space between the outer surface of battery and inner wall of battery holding hole when supporting the battery in support unit. The second spacer forms a heat insulation space when second spacer melts by heat and flows out from the heat shielding space.    USE - Battery holder used in holding e.g. lithium ion batteries used for automobile power supply. Can also be used for holding rectangular or button type batteries.    ADVANTAGE - Provides a battery holder that prevents a chain reaction temperature rise in other batteries if a large temperature rise occurs with a portion of the held batteries, thus prolonging the life of all of the held batteries. Holds the battery firmly even if the second spacer melts and forms a heat insulation space, since the core main body of the battery holder supports the battery by abutting its outer surface. Ensures increased insulating properties due to the formation of the heat insulation space with the outer surface of the battery when the second spacer melts. Ensures strong link and increased alignment of the first and second spacers since the first and second spacers are fitted via the support part and the slit of the battery holder. Includes a second spacer that quickly transmits the heat of the battery before melting, thus promoting more uniformity of the battery temperatures. Provides a location to which the material melted by the first spacer flows easily, in which the location is a formed heat insulation space.    DETAILED DESCRIPTION - The holder unit is interposed between the outer surface of the battery and inner surface of the battery holding hole. The first spacer is made of a first material. The second spacer is made of a second material that has a lower melting point than the melting point of the first material. The second spacer is inserted in the heat shielding space. The support part is a protrusion that projects along the axis direction of the core main body. The second material also has a higher thermal conductivity than that of the thermal conductivity of the first material.    DESCRIPTION OF DRAWING(S) - The drawing is a perspective view showing a state with the batteries held by the battery holder.    Battery holder (10)    Support unit (20)    Battery holding holes (21S)    Holder unit (30)    First spacer (32)    Second spacer (34)    Battery (Bt)