Capacitance detection device, capacitance detection method, and input device

The calculation unit (25) calculates a detection value of the capacitance of the capacitor (Crg) on the basis of the detection signal (Dm). The correction unit (26) repeats the transition to the correction mode, controls the AC voltage output unit (20) such that the difference between the amplitudes of the first AC voltage (V1) and the second AC voltage (V2) changes when the transition to the correction mode, and acquires a correction value corresponding to the change in the detection value of the calculation unit (25) accompanying the change in the difference between the amplitudes. The correction unit (26) corrects the detection value calculated by the calculation unit (25) in accordance with a change in the correction value acquired in the correction mode. 算出部(25)基于检测信号(Dm)来算出电容器(Crg)的静电容的检测值。修正部(26)重复移转到修正模式，在移转到修正模式的情况下，控制交流电压输出部(20)，以使得第1交流电压(V1)与第2交流电压(V2)的振幅之差发生变化，并且，取得与和振幅的差的变化相伴的算出部(25)的检测值的变化相应的修正值。修正部(26)对应于修正模式下取得的修正值的变化来对算出部(25)所算出的检测值进行修正。