A drawer apparatus comprising: a drawer urged in an advancing direction when in a retracted position: a hooker having a hook and a gear; a motor: a transmitter to be shifted from a default state to an engaged state by rotation of the motor, the transmitter being provided with a transmission gear apart from the gear in the default state while engaged with the gear in the engaged state to be rotated by torque of the motor; and a locker provided with a lock to be engaged with the hook in a locked state and with an anchor to be engaged with the drawer in the retracted position in the locked state; wherein the locker is released from the hook to be brought into an operable state when the motor is rotated in one direction in the engaged state; wherein the drawer is released from the anchor to be advanced out of the retracted position when the locker is brought into the operable state; wherein the transmitter is pushed by the locker when the locker is brought into the operable state; wherein the transmission gear is shifted from the engaged state to the default state when the transmitter is pushed by the locker when the locker is brought into the operable state; wherein the anchor is engaged with the drawer when the advanced drawer is pushed back to the retracted position; and wherein the hook is engaged with the lock when the advanced drawer is pushed back to the retracted position. a hooker having a hook and a gear; a motor: a transmitter to be shifted from a default state to an engaged state by rotation of the motor, the transmitter being provided with a transmission gear apart from the gear in the default state while engaged with the gear in the engaged state to be rotated by torque of the motor; and a locker provided with a lock to be engaged with the hook in a locked state and with an anchor to be engaged with the drawer in the retracted position in the locked state; wherein the locker is released from the hook to be brought into an operable state when the motor is rotated in one direction in the engaged state; wherein the drawer is released from the anchor to be advanced out of the retracted position when the locker is brought into the operable state; wherein the transmitter is pushed by the locker when the locker is brought into the operable state; wherein the transmission gear is shifted from the engaged state to the default state when the transmitter is pushed by the locker when the locker is brought into the operable state; wherein the anchor is engaged with the drawer when the advanced drawer is pushed back to the retracted position; and wherein the hook is engaged with the lock when the advanced drawer is pushed back to the retracted position. a transmitter to be shifted from a default state to an engaged state by rotation of the motor, the transmitter being provided with a transmission gear apart from the gear in the default state while engaged with the gear in the engaged state to be rotated by torque of the motor; and a locker provided with a lock to be engaged with the hook in a locked state and with an anchor to be engaged with the drawer in the retracted position in the locked state; wherein the locker is released from the hook to be brought into an operable state when the motor is rotated in one direction in the engaged state; wherein the drawer is released from the anchor to be advanced out of the retracted position when the locker is brought into the operable state; wherein the transmitter is pushed by the locker when the locker is brought into the operable state; wherein the transmission gear is shifted from the engaged state to the default state when the transmitter is pushed by the locker when the locker is brought into the operable state; wherein the anchor is engaged with the drawer when the advanced drawer is pushed back to the retracted position; and wherein the hook is engaged with the lock when the advanced drawer is pushed back to the retracted position.