A vacuum cleaner includes a cleaner body; a suction unit connected with the cleaner body, sucking dust and air, guiding the sucked dust and air to the cleaner body, and having a handle; a moving unit including a wheel and a motor for driving the wheel to automatically move the cleaner body; and a clutch unit connecting the motor and the wheel or releasing the connection of the motor and the wheel according to an operational state of the cleaner body. The clutch unit includes a sun gear connected with the motor, a ring gear connected with the wheel, a plurality of fixed planetary gears disposed to be spaced apart each other between the sun gear and the ring gear, and a moving planetary gear which may transmit a rotational force transmitted to the sun gear to one gear of the plurality of fixed planetary gears.