An excretion detection device 10 comprises: electrode unit 120 configured by using materials with different ionization tendencies a neutralizer retention unit 112 configured to retain a neutralizer for reducing the hydrogen ion index of the bodily waste and an active tag 150 configured to notify the excretion from the living body to outside the excretion detection device. The electrode unite 120 is provided at a position where the electrode unit can be in contact with the bodily waste. The neutralizer retention unit 112 is provided at a position where the neutralizer can be in contact with the bodily waste.
