Stacked laundry treatment device

A stackable laundry treatment apparatus includes: an upper treatment apparatus including: an upper cabinet including an upper side panel forming an upper side shape and an upper base panel forming a lower portion; the drying inner drum is rotatably arranged on the upper box body, and objects to be dried are put into the drying inner drum; an upper drive unit that rotates the drying inner tub; the flow path part supplies and discharges air in the drying inner drum, and the lower processing device comprises a lower box body provided with a lower side face plate forming the lower side face shape, and the upper part of the lower box body is covered by an upper base face plate; an outer tub provided in the lower cabinet and storing wash water; a washing inner tub provided inside the outer tub and into which objects to be washed are put; and a lower driving part, a rotary washing inner tub, and an alignment column leg located inside the upper side panel and the lower side panel and fastened to the upper base panel,