To provide an excrement disposal device capable of appropriately disinfecting an excrement receiving vessel.

When feces are detected inside the excrement receiving vessel, a solenoid valve 41 for water is turned to a closed state, and water in a water supply tank 30 flows into the excrement receiving vessel. Also, a solenoid valve 43 for an antiseptic solution is turned to an open state at prescribed timing and the antiseptic solution flows into the excrement receiving vessel. Also, when washing ends, a solenoid valve 42 for air is turned to an open state and the air flows into the excrement receiving vessel.