An input device for detecting a change in capacitance in accordance with proximity of an object is provided. The input device includes: a sensor unit including multiple capacitive coupling parts formed between multiple driving electrodes and multiple sensing electrodes; a capacitance detector for detecting a capacitance value of each of the capacitive coupling parts; and a two-dimensional data generating unit for generating a two-dimensional data matrix consisting of the capacitance values of the capacitive coupling parts. When a target row or a target column in the two-dimensional data matrix matches a first pattern indicating that multiple capacitive coupling parts each having a capacitance value greater than a reference value are arranged consecutively, the input device updates the reference value.