A washing machine having a simple, leak-tight drain line that can be easily assembled on the wash tub of the washing machine is disclosed. The washing machine includes a valve part that is connected to the wash tub in a sealed fashion and designed in one piece together with the wash tub. The valve part has a drain valve, an outlet connection having a drain opening, and a pipe part connected to the outlet connection and to a drain pump for water transfer. The drain valve can float in the wash water and is moveably disposed inside the valve part to seal the drain opening when wash water is located inside the wash tub and when the drain pump is idle, and to open the drain opening when no wash water is located inside the wash tub and when the drain pump is operating.