To provide a window combining a daylighting function and an air-suction function while having high crime-prevention performance and an excellent design.

The window is provided with an air-introducing part 10 having vertical ribs 11 on both ends and a daylighting part 1 lateral to the vertical rib. The daylighting part has a translucent panel 2 fixed permanently. The air-introducing part includes a louver 12 provided between the vertical ribs, a parallel projecting sash 13 provided indoor side of the louver, a link mechanism 14, a lock mechanism 15 and a tightening material 16. The vertical rib has an outdoor depth wall 21 of the vertical rib, an indoor-side depth wall 22 of the vertical rib and an intermediate width wall 23 of the vertical rib formed between the depth walls. The parallel projecting sash has a stile 17 on both ends while the stile 17 has an outdoor depth wall 31 of the stile, an indoor-side depth wall 32 of the stile and an intermediate width wall 33 of the stile formed between the depth walls. The link mechanism connects the outdoor depth wall of the vertical rib and the outdoor depth wall of the stile. The lock mechanism is mounted on the outdoor depth wall of the stile and the indoor depth wall of the vertical rib. The tight material is placed between the intermediate width wall of the vertical rib and the intermediate width wall of the stile.