A window covering includes a headrail and a covering material positioned under the headrail. The covering material includes a slat assembly. The headrail includes a traverse board and a pressure-dispersion structure, wherein the pressure-dispersion structure is positioned at the traverse board, and protrudes from a bottom surface of the traverse board. On a side of the pressure-dispersion structure facing the slat assembly, a pressure-dispersion area is formed corresponding to a topmost slat of the slat assembly which is closest to the headrail. When the covering material is raised and eventually contacts the headrail, the topmost slat can be controlled to contact at least part of the pressure-dispersion area, whereby to disperse a pressure applied to the slats.