Abstract: A washing machine comprising a roller type agitator and an auto-balancer. The roller type agitator is provided at the lower portion inside the washing tub 3 and includes at least one roller rotatably mounted thereto in order to generate water flow and provide a bending and stretching action and a squeezing action for said laundry articles and a smooth circulation of washing water. The auto-balancer is provided at the upper portion inside the washing tub and includes a plurality of washing protrusions. The roller includes a plurality of washing water ports at the circumferential outer surface and both side surface thereof, respectively. The present invention can provide a washing machine which can provide a good washing effect and an excellent washability irrespective of the quantity of the laundry articles and the volume of the laundry article.