PURPOSE: To use a low-priced ready-made motor and to shorten an assembling time by changing a screwed quantity of a screw which pressures a screw fitting piece with an elastic piece and adjusting an attitude of a motor, in an information processing device which reproduces information from a disk.

CONSTITUTION: A motor 10 for driving a turn table 2 uses a ready-made cylindrical casing motor and fits the turn table 2 to a rotary shaft 10a. At a motor fitting plate 11, a screw fitting piece 13a having a set screw 7 screwed to fixed pieces 12a and 12b and a chassis 5 and a movable piece 13 having a pair of elastic pieces 13b which is inclined and in which the tip abuts with the chassis 5, are installed. The screwed quantity of the set screw 7 is adjusted and a fitting attitude of the motor 10 can be adjusted.