To simply make a bag efficient in electric charging which can electrically be changed by a solar battery of required charging equipment, or the like, of a portable telephone set, or the like.

A flexible printed wiring board 2 forming a necessary circuit is mounted to the inner surface of a bag 1 such as a business bag and a carry bag on the back, a fitting hole of a small solar battery 3 is opened at a prescribed position of the surface of the bag 1 to connect and fit the battery 3 to a prescribed connecting hole of the board 2 and a light-weight charger of a lithium ion battery such as a portable telephone set, a computer, a facsimile equipment, a portable radio, a game device is inserted and fit into the connecting hole at a prescribed position of the board 2 to charge the required charging equipment such as the portable telephone set, the computer, the facsimile equipment, the portable radio, the game device through the charger by the battery 3. Charging efficiency is improved by fitting a condensing lens plate to the surface of the battery 3 and a reflection plate to a lower surface at need.