that the supports 34 extend from the first housing 32 to contact the wall of the recess 15 the surfaces of the supports 34 thereby abut portions of the front member 12 hence the first and second walls 32 a and 32 b are further increased in strength and additionally function to guide the balancer 30 so as to be maintained in the recess 15 in place next the construction of a balancer 40 according to a third embodiment of the present invention will be described with reference to fig7 through 10 fig7 and 8 are perspective views illustrating disassembled and assembled balancers according to the third embodiment of the present invention fig9 is a partially enlarged view of fig7 and fig1 is a sectional view taken along line a a of fig8 as illustrated in fig7 and 8 a balancer 40 includes a first housing 42 having an annular shape and a second housing 43 having an annular shape that is fused to the first housing 42 thereby forming an annular housing corresponding to the recess 15 see fig2 of the spin tub 10 the first and second housings 42 and 43 may be for example formed of synthetic resin such as plastic by injection molding as illustrated in fig9 the first housing 42 has a cross section of an approximately u201c c u201d shape includes fusion ridges 42 a protruding to the second housing 43 at opposite ends thereof which are coupled with the second housing 43 and inner pocket ridges 42 b protruding to the second housing 43 spaced inwardly apart from the fusion ridges 42 a the second housing 43 which is coupled to opposite ends of the first housing 42 in order to form.