A touch input device according to an embodiment comprises: a touch sensor including a plurality of driving electrodes, a plurality of receiving electrodes forming mutual capacitance with the plurality of driving electrodes, and a plurality of receiving dummy electrodes not forming mutual capacitance with the plurality of driving electrodes; and a touch detector including a plurality of receivers composed of a plurality of first terminals for receiving a plurality of first sensing signals, and a plurality of second terminals for receiving a plurality of second sensing signals. The touch detector detects a touch input of an object by subtracting at least one second sensing signal output through at least one second terminal from at least one first sensing signal output through at least one first terminal of at least one receiver.