To provide a problem-solving means that for changing a diaper, a care worker always needs a caution, sometimes confirms it and has difficulties by time and effort and care, and a person to be cared has also constraint, anxiety and displeasure feeling.

The urination in the diaper is made to sense by a sensor 1, and the signal is sent to a receiving alarm by wireless from a transmitter 3, and by a chime and a blink light, a person separated from it is imformed, and furthermore, call can be made by a push button 5 of the transmitter.