of the first housing 22 thus when the balancer 20 is fitted into the recess 15 of the front member 12 of the spin tub 10 the first and second walls 22 a and 22 b are spaced apart from a wall of the recess 15 because of the ends and edges of the first and second housings 22 and 23 which protrude outward from the first and second walls 22 a and 22 b further because the first and second walls 22 a and 22 b are relatively thin the first and second walls 22 a and 22 b are raised outward when centrifugal force is applied thereto by the plurality of balls 21 that move in the internal space 20 a of the balancer 20 in order to perform the balancing function in this manner the plurality of balls 21 make a circular motion in the balancer 20 so that the first and second walls 22 a and 22 b are deformed by the centrifugal force applied to the first and second walls 22 a and 22 b of the first housing 22 in order to prevent this deformation the second housing 22 is provided with supports 24 according to a first embodiment of the present invention the supports 24 protrude from and perpendicular to the first and second walls 22 a and 22 b of the first housing 22 which are opposite each other and may be continued along an outer surface of the first housing 22 thereby having an overall annular shape the supports 24 have a length such that they extend from the first housing 22 to contact.