Patent ID: 8088455

Claim:
A laser treatment method comprising: making a wafer holding unit hold a wafer horizontally, the wafer holding unit being arranged in a cup-shaped container having an exhaust port; thereafter, moving the wafer holding unit and wafer horizontally, while a surface of the wafer is irradiated with a laser beam with a liquid being supplied to the surface of the wafer, thereby scanning the surface of the wafer by the laser beam; thereafter, moving the wafer holding unit to a position for spin-drying of the wafer; thereafter, connecting an exhaust unit to the exhaust port; and thereafter, rotating the wafer holding unit to spin-dry the wafer while an interior volume of the cup-shaped container is exhausted by the exhaust unit through the exhaust port, wherein in the scanning of the surface of the wafer by the laser beam, a drain port, disposed in the cup-shaped container separately from the exhaust port, moves above a tray and receives drainage, when the wafer holding unit moves.