An excretion detection device 100 includes a power supply unit having an electrode 121 and an electrode 122 configured by using materials having different ionization tendencies a solution retention unit 110 configured to retain an electrolyte solution, a temperature sensor 130 configured to detect the temperature information, and an active tag 150 including a radio transmission unit configured to transmit the temperature information detected by the sensor to outside the excretion detection device 100. The electrode 121 and the electrode 122 are installed at a position where the electrodes 121 and 122 can be in contact with the bodily waste and the electrolyte solution, and can also be in contact with the electrolyte solution before the excretion of the bodily waste.
