A defecation/urination determination apparatus including: a feces/urine receiving member that is placed to face a body of a wearer and receives discharged feces and urine a temperature sensor that is placed in the feces/urine receiving member and a control section that determines by a signal that is output from the temperature sensor whether at least one of urine and feces has been discharged, based on a rate at which a temperature falls after detection of a rise of the temperature.本發明的課題是提供可正確判別為排便或排尿的排便排尿判別裝置。其解決手段,具有:與身體對向以接受排便及排尿的排便排尿承接構件;設置在上述排便排尿承接構件的溫度感測器;及藉著從上述溫度感測器所輸出的訊號檢測出溫度的上升後,根據溫度下降的速度,判別為排便或排尿的其中之一的控制部。