An excrement treating apparatus 100 includes an excretion receiver 1 and an apparatus body 2. The excretion receiver 1 includes a receiver body 10 which receives excretions and an excretion sensor 20 which detects the excretions. The apparatus body 2 includes a urine tank 51 which stores urine, a vacuum pump 52 which sucks urine received by the receiver body 10 into the urine tank 51, and a control unit 53. The excretion sensor 20 includes a pair of urine sensor electrodes 21 and 22 which detect urine received by the receiver body 10. The control unit 52 controls so as to reverse the polarity of the urine sensor electrodes 21 and 22 at prescribed time intervals. In the excrement treating apparatus, the excretion sensor's sensitivity is stabilized and urination is accurately detected and treated.