A touch sensor and display apparatus are provided. The touch sensor includes a first opening region, first touch electrodes extending along a first direction and second touch electrodes extending along a second direction; the touch sensor has a first region, a second region and a third region which are sequentially laid out in the second direction, the first opening region is in the second region; an area of a first touch sub-electrode in the first region is less than that of a first touch sub-electrode in the third region, or an area of a second touch sub-electrode in the first region is less than that of a second touch sub-electrode in the third region; a distance between two adjacent second touch sub-electrodes in the first region in the second direction is less than a distance between two adjacent second touch sub-electrodes in the third region in the second direction.