thereby preventing washing water filled in the tub 4 from being leaked the gasket 14 is formed as a bellows of a cylinder shape and has one side fixed to the rear side of the tub 4 and another side fixed to an outer circumference surface of the supporting plate 12 the supporting plate 12 is formed as a disc shape the driving motor 8 is fixed to the rear surface thereof and a rotation shaft 16 for transmitting a rotation force of the driving motor 8 to the drum 6 is rotatably supported by the supporting plate 12 also a supporting unit for supporting the drum 6 with buffering is installed between the supporting plate 12 and the inner wall of the cabinet 2 the supporting unit comprises a plurality of upper supporting rods 22 connected to an upper side of the supporting plate 12 and having a predetermined length buffering springs 24 connected between the upper supporting rods 22 and an upper inner wall of the cabinet 2 for buffering a plurality of lower supporting rods 26 connected to a lower side of the supporting plate 12 and having a predetermined length and dampers 28 connected between the lower supporting rods 26 and a lower inner wall of the cabinet 2 for absorbing vibration herein.