Abstract: The invention relates to an insect protection device for protecting openings such as windows or doors against the entry of insects, comprising a holder (10) that can be installed in front of the opening and an insect protection fabric (12), which is held on the holder and which comprises warp and weft threads (16, 18), which are connected to each other in a grid-like manner, wherein the warp threads (16) and the weft threads (18) lie one upon the other and are connected to each other by binding threads (20). For an exceptionally regular and stable grid structure, it is proposed that the warp threads (16) and weft threads (18) lie one over the other in a separate thread plane in each case and extend in straight lines.