A drainage device for kitchen and bath facilities includes a downspout body (B1) and a pipe cover (B2). The downspout body (B1) is provided with a rotatable linkage unit capable of bending and stretching in vertical direction and a guide unit for guiding vertical movement. The pipe cover (B2) is connected with the upper end of the linkage unit, a coupling member is led out from the side wall of the downspout body (B1), one end of the coupling member is connected with the linkage unit and the other end is connected with an operating mechanism (A).