A touch detecting circuit is allowed to adaptively operate in accordance with an interconnection length to a sensor capacitor of an object to be detected. For example, the touch detecting circuit has a configuration capable of adjusting a threshold value for determination touch and non-touch or a configuration capable of adjusting detection sensitivity of a detection circuit that is connected to the sensor capacitor. For example, the touch detecting circuit has a configuration which includes an adjustment resistor that is connected in series to a signal line for input from the sensor capacitor at an input portion of the detection circuit, and which is capable of performing adjustment to cancel a difference in an interconnection resistance from a sensor capacitor on a far end side to a sensor capacitor on a near end side.