side wall 21 is provided while being slanted with the increase of a diameter of the rotating tub 20 if the rotating tub 20 rotates at a speed of 280 rpm or above in a spin dry operation water separated from the laundry reaches to the side wall 21 due to the centrifugal force and runs to the upper side of the rotating tub 20 along the inner side of the side wall 21 slanted in this case the side wall 21 forms a slope angle u03b8 of 2 degrees to 10 degrees with respect to a line l that is perpendicular to the bottom part 24 if the slope angle u03b8 is smaller than 2 degrees the water does not effectively move along the inner circumferential surface of the side wall 21 and thus the spinning performance is degraded if the slope angle u03b8 is larger than 10 degrees the upper portion of the rotating tub 20 is widened and thus the overall width is increased as described above a plurality of drain holes 22 are formed at the upper portion of the rotating tub 20 to discharge the water separated from the laundry to the outside the rotating tub 20 the water discharged to the rotating tub 20 through the drain hole 22 flows to the bottom plate 3 of the mounting part 2 along an inner circumferential surface of the body 1 and then is discharged to the outside through the first.