A washing machine is provided. The washing machine may include a cabinet and a tub. The cabinet may define an exterior of the washing machine. The tub may be disposed inside the cabinet to hold wash water. The tub may have a cross-section on which a first length passing through a central longitudinal axis of the tub and extending from a first side to a second side along a first direction, which is substantially horizontal, may be shorter than a second length passing through the central longitudinal axis of the tub and extending from a third side to a fourth side along a second direction, which is perpendicular to the first direction.