A touch input device according to an embodiment is capable of detecting a pressure of a touch on a touch surface and may include: a display module; and a pressure sensor which is disposed at a position where a distance from a reference potential layer may vary according to the touch for the touch surface, the distance is changeable according to a pressure magnitude of the touch, the pressure sensor may output a signal including information on a capacitance which is changed according to the distance, the pressure sensor may include a plurality of electrodes to form a plurality of channel, and detect the magnitude of the pressure for the touch based on a change amount of a capacitance detected in the each channel and an SNR improvement scaling factor assigned to each of the channels.