A lithium secondary battery includes a battery case, an internal electrode body contained in the battery case and including a positive electrode, a negative electrode and a separator made of porous polymer, the positive electrode and the negative electrode are wound or laminated. The backrest includes a backrest panel and backrest inserts. The issue queue provides storage resources for real and virtual loadstore instructions. A humidity adjustment section adjusts the humidity adjusting capacity of the humidity controller such that the absolute humidity of the room may come very close to the target absolute humidity As.