To easily remove materials plugged in a drain pipe in eating houses without causing environmental problems.

This device for removing materials plugged in a drain pipe comprises a shell powder-mixed water H, a tank 3 storing the mixed water H, a stirring means 10 stirring the mixed water H in the tank 3, discharge means 12, 13 discharging the stirred mixed water H to the outside of the tank 3, and a water guide means 28 for guiding the mixed water H discharged by the discharge means 12, 13 into the drain pipe.