The present design allows the sink to be opened and closed with a drain plug with a simple structure, thereby simplifying the structure and reducing the cost of manufacturing and improving the workability according to construction, while preventing the risk of loss and at the same time ensuring accurate opening and closing operation. A drainage opening and closing device for a wash basin, the drain plug 100 to open and close the drainage of the sink is provided in a disc shape of stainless steel, while the outer peripheral edge in the circumferential direction tapered surface 12 and the handle (11) A shield 10 having a); Two support legs (21) (31) and their support legs (21) (31), which are fastened to be staggered to each other by fastening bolts (40) at the lower portion of the shield (10), are bent by metal pieces to face each other. A pair of support members 20 and 30 each having a bending groove 22 bent inwardly at an upper portion thereof and closely supported by the inner diameter of the drain hole 2; Each of the support legs 21 of the one side support member 20 is provided to be bent outwardly and has a right angle at the top and at the same time has a slope inclined downward in the drain hole 6 of the drain hole (2) It is configured with a jaw (23).
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