A voice coil motor coupling structure of a hard disk drive for coupling a voice coil motor to a base plate of the hard disk drive, the voice coil motor includes a coil coupled to a rear end portion of an actuator arm, an upper yoke and a lower yoke provided at upper and lower portions of the coil, respectively, separated at a predetermined distance from the coil, and a magnet attached to the lower surface of the upper yoke. The voice coil motor coupling structure includes a countersink formed in the lower yoke, a countersunk head screw inserted in the countersink and coupled to a screw coupling hole provided in the base plate to fix the lower yoke to the base plate, a boss insertion hole formed in each of the lower and upper yokes at both end portions in a lengthwise direction, a boss protruding from the base plate and inserted in each of the boss insertion holes to prevent horizontal movements of the lower yoke and the upper yoke, and a screw inserted in each of the boss insertion holes and coupled to a screw coupling hole provided at each boss to fixedly couple the upper yoke to the lower yoke. Thus, the lower yoke of the voice coil motor can be stably fixed at an accurate position not only on a flat type base plate but also on a bowl type base plate.