A dishwasher (100) is disclosed. The dishwasher (100) includes a washing tub (130) for defining a washing space, a rack (200) provided in the washing tub (130) so as to be withdrawn from the washing tub (130) for receiving dishes, and a plurality of spraying units (132, 133, 134) for spraying wash water to the rack (200). The rack (200) includes an outer edge rib (210) for defining a space in which dishes are loaded, a variable space loading unit (240) upwardly and downwardly movably provided at the inside of the outer edge rib (210), and a lifting unit (250) provided at the outer edge rib (210) for upwardly and downwardly moving the variable space loading unit (240) to decrease and increase the loading space of the variable space loading unit (240).