Disclosed herein is a drum washing machine having an improved motor mount structure. The drum washing machine includes a tub having a coupling part; a drum rotatably installed in the tub; a motor bracket installed at the coupling part; and an elastic member having a cylindrical shape and disposed between the motor bracket and the tub, wherein the elastic member comprises a rib protruding in a radial direction from the inner circumferential surface of the elastic member, and the rib has the longest protrusion at a longitudinal center of the elastic member.