Disclosed is a cleaner comprising a cleaner body, a handle provided in the cleaner body, a wheel provided in a lower portion of the cleaner body and rotatably supporting the cleaner body, a motor driving the wheel electrically, an encoder sensing the rotation number of the wheel or the motor, and a controller controlling the driving of the motor by varying the voltage applied to the motor based on the rotation number sensed by the encoder, wherein the controller electrically drives the wheel by applying voltage to the motor when the velocity of the cleaner body initially moving is a preset value or more, and a controlling method for the cleaner.