A clip for holding banknotes has a first clasp portion and a second clasp portion for holding banknotes therebetween. Two heat radiating plates sandwich opposite surfaces of the rechargeable batteries of the rechargeable battery group and are held against circumferential surfaces of the rechargeable batteries. The exterior member includes a flexible pouch and a can connected to the pouch and formed of a material having a greater hardness than that of the pouch. % of docosahexaenoic acid and 0. The gas laser device controls the laser gas supplying device so that, when the laser gas is excited by the exciting device, the laser gas is circulated at a first circulating rate and so that, when the laser gas is not excited by the exciting device, the laser gas is circulated at a second circulating rate lower than the first circulating rate.