An actuator latch device for locking an actuator of a hard disk drive, the actuator having a swing arm rotatably installed at a base member, a voice coil motor (VCM) coil provided at one end of the swing arm, and magnets oppositely arranged at the VCM coil. The actuator latch device includes a notch provided at one end of the swing arm; a latch lever, which is rotatably installed at a base member, having at a first end thereof a hook interfering with the notch to restrict one way rotation of the swing arm, and a counterbalance device at a second end thereof; and a stopper provided in the base member to block the counterbalance device to restrict a rotation of the latch lever.