An actuator latch mechanism of a hard disk drive locks an actuator when the hard disk drive is not operating, and the actuator includes a swing arm rotatably installed to a base member, a VCM coil coupled to one end portion of the swing arm, and a magnet facing the VCM coil. The actuator latch mechanism includes a notch portion protruding from the end portion of the swing arm; a latch lever pivotally installed to the base member and having a hook engaging the notch portion at one end thereof when the actuator is locked; a protrusion protruding from an edge of the magnet toward the latch lever; a first iron core installed to the end portion of the swing arm and applying a first torque to the swing arm by a flux generated from the protrusions; and a second iron core installed to the other end of the latch lever and applying a second torque to the latch lever by the flux generated from the protrusion.