A washing machine in which a detergent case is located below a washing tub unit and detergent and wash water are supplied from the detergent case to the washing tub unit by a pump. An overflow hole to prevent overflow of water to the outside the detergent case is provided on the detergent case, and the detergent and the wash water do not overflow the detergent case and are discharged to an outside of the washing machine through the overflow hole when the pump breaks down.