Washing machine having steam generator

The present invention relates to drum type washing machines, and more particularly, to a new type of steam generator for a drum type washing machine, which enables fast and effective washing and drying of laundry, and can provide a refresh effect of removal of wrinkles form, and sterilization of the laundry. For this, a steam generator includes a steam generating portion having a water supply inlet at one side and an outlet at the other side, and a space between the water supply inlet and the outlet, a water supply flow line connected to the water supply inlet for guiding the water to the space, a discharge flow line connected to the outlet for guiding a flow of steam generated at the space, a bypass flow line connected to the water supply flow line for discharging the water overflowing from the steam generating portion in a case water is supplied in a state the outlet and/or the discharge flow line are blocked, and a heater for heating the water supplied through the water supply inlet to generate the steam.