A device for detecting a state of a diaper includes a sensor unit with a conducting unit including at least two electrodes. The electrodes are configured to detect electrical parameters of their environment. A coupling portion is disposed on at least one end side of the conducting unit and is connectable to a measuring device. The conducting unit is attached to a carrier layer. The measuring device comprises an input portion being connectable to the sensor unit, and a processor configured to receive signals corresponding to values of the electrical parameters detected by the sensor unit and to process said signals. A power control means is configured to control electrical power supplied from a power supply, and a determination means is configured to determine whether a state of a diaper has changed. A transmitting means is configured to transmit information regarding the determined state change to a receiving means.