Abstract: The present application provides an input device. The input device comprises a key module, a capacitance detection module and a control module. The key module receives a physical pressing signal and correspondingly feeds back a capacitance change signal, the capacitance detection module receives the capacitance change signal from the key module and determines the working state of the key module, and the control module receives the determination result from the capacitance detection module and correspondingly generates an input signal. The key module comprises a key switch and a capacitor circuit arranged in series. The key module responds to the external physical pressing signal, and correspondingly adjusts the capacitance value change of the key module. By serially connecting a capacitor circuit, the sensitivity of determining the working state of a key module is improved, the requirements for assembly precision of a key switch are reduced, and the installation difficulty of products is reduced.