PURPOSE:To obtain a stable rocking function even when an upper arm and a carriage are opened and rocked by supporting pivotally a carriage assembling body with a single guide rail in such a way that it can be rocked freely, and applying almost uniform weight balance in right and left directions around a rocking shaft. CONSTITUTION:The single guide rail 38 is fixed on a frame 10 at a position separated by a prescribed interval in parallel from the moving path of a head decided in the radial direction of a floppy disk, and the carriage 32 is supported on the guide rail 38 in such a way that it can be slided freely and also rocked freely. And the almost uniform weight balance in the right and left directions for the rocking shaft of the guide rail 38 is applied on the carriage assembling body 37 formed with the carriage 32 and the upper arm 36. Thereby, an opening function can be performed stably at the time of opening the upper arm 36 upward and the carriage 32 downward, and also, no difference of posture due to the unbalance of weight for the movement of the carriage 32 is generated in the carriage assembling body 37 even in an ordinary read/write operation.
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