Abstract: Disclosed is a washing machine having a bubble feeding device installed at the inner surface of a door of the top of a washing body for feeding air bubbles into a rotatable tub to the top of a washer body. The bubble feeding device comprises a telescopic pipe and a drive device for driving the pipe. The drive device includes a motor and first and second pulleys operatively connected to the motor. The second pulley has gear teeth formed on its circumference and a flexible string having a train of teeth is wound on the second pulley to mesh the train of teeth with the gear teeth. The flexible string extends into an inner telescopic pipe coaxially installed within the telescopic pipe and the end of the string is fixed to the lower end of the inner pipe.