A novel-structure laundry machine that is capable of washing laundry using steam is disclosed. The laundry machine includes a machine body (100) constituting the external appearance thereof, a drum (300) mounted in the machine body for receiving laundry, a steam generation unit (400) for generating steam, and a primary steam supply part (610) for supplying the steam generated in the steam generation unit (400) into the lower part of the drum (200).