Steam generator for steam oven

A steam generator for a steam oven. The steam generator includes a water injection unit (60) for supplying water from the outside to the steam generator therethrough; a water tank (70) installed outside a cooking chamber (52) for storing the water supplied through the water injection unit (60); a flow adjusting unit (75) installed at an outlet of the water tank (70) for adjusting the quantity of the supplied water; a steam pipe (81) connected between the flow adjusting unit (75) and the cooking chamber (52) for changing the water therein into steam and supplying the steam to the inside of the cooking chamber (52); and a heater (83) installed in the steam pipe (81) for heating the water supplied to the inside of the steam pipe (81), thereby reducing the overall size of the oven to relatively increase the size of the cooking chamber (52), and rapidly generating the steam without increasing the capacity of the heater (83) to shorten the overall cooking time.