PURPOSE: To eliminate the need for a mounting circuit substrate exclusively for a power supply for reducing the cost by equipping a means for fixing a power supply connector to a structure body via a mounting part.

CONSTITUTION: A mounting part 12 formed in one piece with a resin in both side parts of a power supply connector 11 of a floppy disk device. The power supply connector 11 is directly fixed on the side surface or the upper surface of a structure body 13 of a disk device via the mounting part 12 using a fixing screw 14. A power supply cable is soldered to a pin for fixing a magnetic head 16 and a stepping motor 15 for driving a head arm 17 is provided. In this manner, by directly mounting the structure body 13 by forming the mounting part 12 at the power supply connector 11 in one piece, the power supply connector mounting circuit substrate can be reduced, thus reducing the cost of the circuit substrate and packaging man-hour.