Disclosed is a washing machine including an inner tub in which fabrics are accommodated, a fixing hub installed to the inner tub, a rotating shaft configured to penetrate the inner tub and the fixing hub, a sun gear installed to the rotating shaft and having a lower gear portion and an upper pulsator coupling portion, an inner pulsator coupled to the pulsator coupling portion, a plurality of planetary gears engaged with the gear portion and rotatably arranged on the fixing hub, a ring gear having an inner circumferential surface engaged with the planetary gears, a gear box coupled to the ring gear, and an outer pulsator coupled to the gear box, the outer pulsator being larger than the inner pulsator. As the inner pulsator and outer pulsator are rotated at different rates of rotation, complex 3D water stream may be created in the inner tub, resulting in enhanced washing ability.