The vacuum cleaner includes a cleaner body comprising a suction motor for generating a suction force, a suction part that communicates with the cleaner body to suction air and dusts, a battery disposed in the cleaner body or the suction part to supply a power to the suction motor, a charger separably connected to the cleaner body or the suction part to charge the battery, and a voltage regulator regulating a voltage between an output terminal of the charger and the suction motor so that a voltage outputted from the charger is greater than that inputted into the suction motor.