The present invention relates to a steam iron, including: a body part in which a water tank for storing water and a steam generating device for converting water supplied from the water tank into steam are installed; a main hot plate part which is installed at one side of the body part and formed with a plurality of main steam outlets for discharging steam generated by the steam generating device; and a hot plate cover part which includes an auxiliary hot plate formed with an auxiliary steam outlet through which steam discharged from the plurality of main steam outlets is discharged, and detachably coupled with the body part.