DISK DRIVING DEVICE

PURPOSE:To prevent the occurrence of ununiform rotation due to a ball bearing by press-fitting an elastic washer to fix an FG yoke between the elastic washer and a bearing holder after engaging the FG yoke with the bearing holder to center this yoke. CONSTITUTION:A slight taper is provided in the inside part of a bearing holder 11a under the position where an FG yoke 5 should be engaged, and a gap is provided between the bearing holder 11a and the outer wheel of a ball bearing 12b, and the FG yoke 5 is softly engaged with the bearing holder 11a and is centered, and an elastic washer 15 is press-fitted to fix the FG yoke 5 between the elastic washer 15 and the bearing holder 11a. By this structure, the FG yoke 5 is firmly fixed to the bearing holder 11a, and shake and slip-off of the FG yoke 5 are prevented.