The invention relates to a combining structure between a stator and a drum used for a washing device. The roller washing machine comprises a drum which has a posterior wall surface and is of drum shape with the inner part hollow; a stator comprises an iron core part forming a plurality of sawteeth, a coil reeved on the sawteeth, a posterior wall surface combined at the drum and surrounded around a first insulator at the front part of the iron core part and a second insulator at the rear part of the iron core part, a plurality of reeving ribs which protrude to the front side at the periphery in front of the first insulator and surround a part of the coil; the rotor which is arranged outside the stator and forms a motor together with the stator; a fixed part which is arranged between the posterior wall surface of the drum and each reeving rib of the stator; each reeving rib can be fixed on the posterior wall surface of the drum.