Capstan device for cassette recorder seat

The utility model relates to a capstan device for a cassette recorder seat, which is composed of a capstan belt pulley, a metal circular plate and a capstan spindle, wherein the periphery of a column of the capstan belt pulley is provided with a plurality of flexible positioning tabs with positioning blocks and the circumference of a round hole formed on the metal circular plate has positioning slots with positioning parts. After sheathed in the concave grooves of the positioning slots of the metal circular plate, the positioning blocks of the flexible positioning tabs of the capstan belt pulley rotate oppositely, so that the positioning blocks are clamped in the positioning parts, and the positioning blocks and the positioning parts are fixed and combined together mutually, therefore the rotary inertia of the utility model is increased and the relative slide generated by the metal circular plate during the rotation of the capstan belt pulley is avoided.