HEAT TRANSFER SUPPRESSION SHEET AND BATTERY PACK

Provided are a heat transfer suppression sheet having an excellent heat transfer prevention effect and excellent retainability of inorganic particles and shape retainability at a high temperature, and a battery pack in which the heat transfer suppression sheet is interposed between battery cells. The heat transfer suppression sheet () includes inorganic particles (), first inorganic fibers (), and second inorganic fibers (). An average fiber diameter of the first inorganic fibers () is larger than an average fiber diameter of the second inorganic fibers (). The first inorganic fibers () have a linear shape or a needle shape, and the second inorganic fibers () have a dendritic shape or a crimped shape.