A washing machine, more particularly, an improvement in the structure of a drive unit included in a drum type washing machine is disclosed. The washing machine includes a tub for receiving wash water therein, a drum rotatably disposed in the tub and adapted to wash laundry received therein, a shaft penetrated through the tub to thereby be connected to the drum, the shaft being adapted to transmit a drive force of a motor to the drum, a stator coupled fixedly to a rear wall portion of the tub, and a rotor including at least one magnet, a back yoke defining a magnetic path, and a rotor frame rotatably disposed at the outside of the stator, the rotor frame being connected to the shaft so as to transmit a rotating force of the rotor to the shaft. The rotor frame includes a side wall portion and a rear wall portion, and is made of an aluminum material.