To unnecessitate a power supply to a recording media type adaptor with a compatible form with recording media like a floppy disk, etc., or to remarkably lengthen replacement period of a battery.

In a floppy disk type adaptor 10 to enable reading and writing of the recording media (e.g. a memory card) except the floppy disk by utilizing a floppy disk drive of a personal computer, etc., a thin power generator 20 is mounted in a casing 16, a metallic rotating body for chucking (drive chucking part 30) which is similar to the floppy disk is simultaneously provided and the drive chucking part 30 is linked with a rotary shaft 26 of the power generator 20. Since the floppy disk drive is provided with a spindle to rotate a rotary magnetic material (disk), the power is generated by utilizing rotary driving force of the spindle and the power supply of the adaptor 10 is covered by the current generated by the spindle.