PURPOSE: A drain plug washing device of a washstand is provided to wash the drain plug by downward spraying water to the lower part of the drain plug. CONSTITUTION: A drain plug washing device of a washstand comprises a drain plug(7) and a nozzle(30). The drain plug is mounted on a drain(3) of the washstand which is connected to a drain line(5) in order to open and close the drain. The nozzle is installed on the center part of the drain line to outside. The nozzle sprays water to the drain plug. The nozzle is inserted to a through hole which is formed on the center part of the drain line. A protrusion is formed on the center part of the nozzle.
