The present disclosure provides a sensing device including a substrate and a sensing pixel. The sensing pixel is disposed on the substrate and includes an electrode and a thermistor. The thermistor is electrically connected to the electrode and is separated from the substrate by an air gap. When the sensing pixel is operated in a period, the electrode receives a voltage, and a part of the thermistor moves toward the substrate, such that the thermistor is in thermal conduction with the substrate.