A laundry treatment apparatus is provided that includes a condensing pool disposed within a water supply port formed in a tub, a water supply passage formed between the condensing pool and the water supply port, and a cap that guides water to the condensing pool and stops steam flowing backward through the water supply passage so that the steam is introduced into the condensing pool. The steam flowing backward from an inside of the tub to the water supply port of the tub is brought into contact with the water contained in the condensing pool and is condensed, thereby preventing pollution of a detergent holder or peripheral portions thereof, which may occur when the steam flows backward into the detergent holder or peripheral portions thereof via the water supply port of the tub.