To provide a card generator which suppresses consumption of a battery sufficiently.

Kinetic energy produced by movement, etc., is converted into mechanical energy by a mechanical energy converting means 2, and is stored in a mechanical energy storing means 3. A case 8 in the shape of a card has a power generating mechanism within it, which drives a generating means 4 by this storing means 3. Since the case 8 is not bulky because of its card shape when it is carried, and generates power by walking, etc., of a user who carries it, it is favorable for supplying power to portable information apparatuses and communication apparatuses. Since batteries become unnecessary on the occasion of use of the portable information apparatuses and communication apparatuses, battery consumption is suppressed even if the market for the information and communication apparatuses develops, and occurrence of various problems caused by the disposed of batteries is suppressed.