To further improve a shape retention property, strength, compression properties, and the like required for a heat transfer suppression sheet, and to prevent the shape retention property, the strength, the compression properties, and the like of the entire sheet from decreasing even when a battery cell experiences thermal runaway. A heat transfer suppression sheet contains: at least one of a first inorganic fiber (1) having a glass transition point of 800°C or lower and first inorganic particle (2) having a glass transition point of 800°C or lower; a second inorganic fiber (3) having a glass transition point of 1000°C or higher; second inorganic particle (4) having a glass transition point of 1000°C or higher; and an organic binder (5).