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 according to the third embodiment of the present invention and fig9 is a rear sectional view showing the drum type washing machine according to the third embodiment of the present invention the drum type washing machine according to the third embodiment of the present invention comprises a cabinet 2 for forming an appearance of a washing machine a tub 50 formed integrally with the cabinet 2 and for storing washing water a drum 6 rotatably arranged in the tub 50 for washing and dehydrating laundry and a supporting unit positioned at the rear side of.