A touch input device (100-4) comprising: a touch portion configured to receive a touch signal of a user; a base disposed at a lower side of the touch portion , having pattern grooves formed in an area corresponding to the touch portion and sensing patterns comprising a conductive material and arranged on the pattern grooves ; wherein the base comprises: a first base disposed at a lower side of a parent material ; and a second base disposed at a lower side of the first base ; wherein the pattern grooves and the sensing patters include: first pattern grooves and first sensing patterns formed on one surface of the first base ; and second pattern grooves and second sensing patterns formed on one surface of the second base ; characterized in that the touch portion is provided with a concave portion ; wherein the first sensing patterns located at a lower side of the concave portion have a vertical cross-sectional width greater than that of the first sensing patterns located at an outer side of the concave portion such that the first sensing patterns located at the lower side of the concave portion have a resistance smaller than that of the first sensing patterns located at the outer side of the concave portion ; and wherein the second sensing patterns located at the lower side of the concave portion have a vertical cross-sectional width greater than that of the second sensing patterns located at the outer side of the concave portion such that the second sensing patterns located at the lower side of the concave portion have a resistance smaller than that of the second sensing patterns located at the outer side of the concave portion . a touch portion configured to receive a touch signal of a user; a base disposed at a lower side of the touch portion , having pattern grooves formed in an area corresponding to the touch portion and sensing patterns comprising a conductive material and arranged on the pattern grooves ; wherein the base comprises: a first base disposed at a lower side of a parent material ; and a second base disposed at a lower side of the first base ; a first base disposed at a lower side of a parent material ; and a second base disposed at a lower side of the first base ; wherein the pattern grooves and the sensing patters include: first pattern grooves and first sensing patterns formed on one surface of the first base ; and second pattern grooves and second sensing patterns formed on one surface of the second base ; first pattern grooves and first sensing patterns formed on one surface of the first base ; and second pattern grooves and second sensing patterns formed on one surface of the second base ; characterized in that the touch portion is provided with a concave portion ; wherein the first sensing patterns located at a lower side of the concave portion have a vertical cross-sectional width greater than that of the first sensing patterns located at an outer side of the concave portion such that the first sensing patterns located at the lower side of the concave portion have a resistance smaller than that of the first sensing patterns located at the outer side of the concave portion ; and wherein the second sensing patterns located at the lower side of the concave portion have a vertical cross-sectional width greater than that of the second sensing patterns located at the outer side of the concave portion such that the second sensing patterns located at the lower side of the concave portion have a resistance smaller than that of the second sensing patterns located at the outer side of the concave portion . <EOS>