A touch display apparatus including a display panel and a plurality of touch electrodes is provided. The touch electrodes overlap the display panel and have a plurality of wire segments that intersect each other. A first spacing SP1 between any adjacent two of the wire segments arranged along a first direction satisfies a relationship below: 0 . 9 ⁢ 8 × ( 2 ⁢ 5 ⁢ 4 ⁢ 0 ⁢ 0 P ⁢ P ⁢ I × ( B / N ) ) ≤ S ⁢ P ⁢ 1 ≤ 1 . 0 ⁢ 2 × ( 2 ⁢ 5 ⁢ 4 ⁢ 0 ⁢ 0 P ⁢ P ⁢ I × ( B / N ) ) , where PPI is the number of pixels per inch of the display panel, B is 1.8 or 2.1, and N is 1 or a positive even number.