Disclosed is a defecation detection device having a defecation receiving member which faces the body of a person and receives defecation a first temperature sensor which is disposed at a the defecation position, in the defecation receiving member, which receives defecation a second temperature sensor which is disposed at a non-defecation position, in the defecation receiving member, which does not receive defecation and a control unit which detects the presence or absence of defecation on the basis of signals output from the first temperature sensor and signals output from the second temperature sensor.