plate 12 is supported by the buffering springs 24 and the dampers 28 mounted between the supporting plate 12 and the inner wall of the cabinet 20 fig6 is a front sectional view of a drum type washing machine according to a second embodiment of the present invention the drum type washing machine according to the second embodiment of the present invention has the same construction and operation as that of the first to embodiment except a shape of the tub that is the tub 40 according to the second embodiment has a straight line portion 42 with a predetermined length at both sides thereof the straight line portion 42 is fixed to the inner wall of both sides of the cabinet 2 or integrally formed at the wall surface of both sides of the cabinet 2 like this since the tub 40 according to the second embodiment has both sides fixed to the cabinet 2 as a straight line form the diameter of the tub 40 can be increased accordingly the diameter of the drum 6 arranged in the tub 40 can be more increased fig7 is a front sectional view showing a drum type washing machine according to a third embodiment of the present invention fig8 is a longitudinal sectional view of the drum type washing machine.