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 the buffering springs 24 and the dampers 28 are installed at a center of gravity of an assembly composed of the drum 6 the supporting plate 12 and the driving motor 8 that is the upper and lower supporting rods 22 and 26 are prolonged from the supporting plate 12 to the center of gravity of the assembly the buffering springs 24 are connected between an end portion of the upper supporting rod 22 and the upper.