The invention provides a washing machine which can highly efficiently wash the interior surface and the exterior surface of a rotary drum and the whole interior surface of a bucket. A bucket cleaning option is executed through combining a first procedure and a second procedure, i.e., the first procedure is a process of driving the rotary drum to rotate at a first rotating speed when the bucket is filled with water; and the second procedure is a process of driving the rotary drum to rotate at a second rotating speed, wherein the second rotating speed is a rotating speed higher than the first rotating speed and lower than a point of resonance. Under the second rotating speed, the centrifugal force acting on water attached to the rotary drum is larger than the gravity.