Touch detection device

The present invention relates to a touch detection device that suppresses a reduction in detection accuracy of a touch operation. When a touch operation unit is pressed for a long time (Ts) or more, a controller updates a reference capacitance value (Cbase), which is a reference for detecting a threshold value (Cth) of the touch operation, on the basis of an electrostatic capacitance value (Cap). The update of the reference capacitance value sets the electrostatic capacitance value before the decrease as an initial value (C0), and sets the electrostatic capacitance value ([delta] C) according to whether the electrostatic capacitance value is greater than or equal to the predetermined capacitance value (Cref) (steps 120 to 128). Then, the electrostatic capacitance value after the change of the electrostatic capacitance value with respect to the initial value reaches the electrostatic capacitance value ([delta] C) is set as the reference capacitance value (steps 132-140). As a result, it is possible to appropri