A touch sensor comprising: a base comprising: a sensing region (SA) comprising a rounded corner; and a non-sensing region (NSA) outside the sensing region; first sensing electrode columns (TSC1) extending in a first direction on the base, each first sensing electrode column (TSC1) among the first sensing electrode columns comprising a plurality of first sensing electrodes (TSE1), each first sensing electrode among the first sensing electrodes comprising a plurality of sub-electrodes (SUE1, SUE2, SUE3, SUE4); and second sensing electrode columns (TSC2) alternately disposed with the first sensing electrode columns (TSC1) on the base, each second sensing electrode column (TSC2) among the second sensing electrode columns comprising a plurality of second sensing electrodes (TSE2), wherein the sub-electrodes of one first sensing electrode among the first sensing electrodes are respectively electrically connected to sub-electrodes of an adjacent first sensing electrode, wherein a sub-electrode (SUE1_1, SUE1_2, SUE1_3, SUE1_4, SUE1_5) closest to the rounded corner among the sub-electrodes comprises a rounded edge corresponding to the rounded corner, and wherein a second sensing electrode (TSE2_1, TSE2_2, TSE2_3, TSE2_4, TSE2_5) closest to the rounded corner among the second sensing electrodes comprises: a rounded edge corresponding to the rounded corner; and a protrusion part (PTA, PTA_1, PTA_2, PTA_3, PTA_4) protruding toward the sub-electrode comprising the rounded edge. a base comprising: a sensing region (SA) comprising a rounded corner; and a non-sensing region (NSA) outside the sensing region; a sensing region (SA) comprising a rounded corner; and a non-sensing region (NSA) outside the sensing region; first sensing electrode columns (TSC1) extending in a first direction on the base, each first sensing electrode column (TSC1) among the first sensing electrode columns comprising a plurality of first sensing electrodes (TSE1), each first sensing electrode among the first sensing electrodes comprising a plurality of sub-electrodes (SUE1, SUE2, SUE3, SUE4); and second sensing electrode columns (TSC2) alternately disposed with the first sensing electrode columns (TSC1) on the base, each second sensing electrode column (TSC2) among the second sensing electrode columns comprising a plurality of second sensing electrodes (TSE2), wherein the sub-electrodes of one first sensing electrode among the first sensing electrodes are respectively electrically connected to sub-electrodes of an adjacent first sensing electrode, wherein a sub-electrode (SUE1_1, SUE1_2, SUE1_3, SUE1_4, SUE1_5) closest to the rounded corner among the sub-electrodes comprises a rounded edge corresponding to the rounded corner, and wherein a second sensing electrode (TSE2_1, TSE2_2, TSE2_3, TSE2_4, TSE2_5) closest to the rounded corner among the second sensing electrodes comprises: a rounded edge corresponding to the rounded corner; and a protrusion part (PTA, PTA_1, PTA_2, PTA_3, PTA_4) protruding toward the sub-electrode comprising the rounded edge. a rounded edge corresponding to the rounded corner; and a protrusion part (PTA, PTA_1, PTA_2, PTA_3, PTA_4) protruding toward the sub-electrode comprising the rounded edge. <EOS>