To surely suck filth excreted in a cup by a suction/exhaust fan or a vacuum pump.

This device is provided with the cup applied to the buttocks of a user; and a filth tank 3 connected to the cup by a connection tube and sucking and storing the filth excreted in the cup by the suction/exhaust fan or the vacuum pump, wherein the cup is formed with an excrement receiving groove for receiving the excrement in its inner base, and a drain hole is opened in the base of the excrement receiving groove, while the drain hole is connected to the connection tube via a trap-like drainage.