A touch sensor, comprising: a base layer; a first electrode unit comprising first touch electrodes arranged on the base layer along a first direction and electrically connected to each other along the first direction; second electrode units spaced apart from one another along the first direction, each of the second electrode units comprising second touch electrodes arranged on the base layer along a second direction intersecting the first direction and electrically connected to each other along the second direction, each of the second touch electrodes comprising a second opening; and a first strain gauge comprising first resistance lines electrically connected to each other along the first direction, each of the first resistance lines being disposed in a respective second opening disposed in a first row among the second openings; the first touch electrodes, the second touch electrodes, and the first resistance lines are disposed in the same first layer, Li, characterized in that: the first electrode unit further comprises a first connection portion connecting adjacent first touch electrodes along the first direction among the first touch electrodes, each of the second electrode units further comprises a second connection portion connecting adjacent second touch electrodes along the second direction among the second touch electrodes, the second connection portion being insulated from the first connection portion, the first strain gauge further comprises a first connection line connecting adjacent first resistance lines along the first direction among the first resistance lines; one of the first connection portion and the second connection portion is disposed on a second layer, L2, different from the first layer, the other of the first connection portion and the second connection portion is disposed on the first layer, and the first connection line is disposed on the second layer, and an insulating layer being disposed between the first layer and the second layer. a base layer; a first electrode unit comprising first touch electrodes arranged on the base layer along a first direction and electrically connected to each other along the first direction; second electrode units spaced apart from one another along the first direction, each of the second electrode units comprising second touch electrodes arranged on the base layer along a second direction intersecting the first direction and electrically connected to each other along the second direction, each of the second touch electrodes comprising a second opening; and a first strain gauge comprising first resistance lines electrically connected to each other along the first direction, each of the first resistance lines being disposed in a respective second opening disposed in a first row among the second openings; the first touch electrodes, the second touch electrodes, and the first resistance lines are disposed in the same first layer, Li, characterized in that: the first electrode unit further comprises a first connection portion connecting adjacent first touch electrodes along the first direction among the first touch electrodes, each of the second electrode units further comprises a second connection portion connecting adjacent second touch electrodes along the second direction among the second touch electrodes, the second connection portion being insulated from the first connection portion, the first strain gauge further comprises a first connection line connecting adjacent first resistance lines along the first direction among the first resistance lines; one of the first connection portion and the second connection portion is disposed on a second layer, L2, different from the first layer, the other of the first connection portion and the second connection portion is disposed on the first layer, and the first connection line is disposed on the second layer, and an insulating layer being disposed between the first layer and the second layer.