A drum washing machine has a suspension for supporting a water tub for vibration proof. The suspension includes a cylindrical bearing support, a pair of bearings fixed in the bearing support, a shaft supported on the bearings so that the shaft is linearly reciprocated, a cylindrical friction member damping an amplitude of the water tub and disposed between the bearings so as to be immovable relative to the bearing support, and a lubricant applied between the shaft and the friction member. The friction member has both ends formed with abutment slant faces having outer diameters gradually reduced toward distal ends respectively. A pair of holding members are located in the bearing support for holding the ends of the friction member. Gaps are defined between the friction member and the holding members respectively. A plurality of lubricant reservoirs are defined in the respective gaps to reserve the lubricant.