PURPOSE: To suppress the curtain from being whirled up by the wind, while decreasing a fact that the light shielding performance is spoiled.

CONSTITUTION: In the curtain which consists of a planar curtain main body 1 having light shieldability, and in which its upper end part side is provided in a hanging state, and the lower end part side is allowed to float freely, a wind vent part 2 which consists of a net and takes light shieldability into consideration is provided in the part separated to the lower side from the upper end part of the curtain main body 1, and in the case where the curtain is used by hanging and providing it at the window, wind pressure for working on the curtain is decreased by allowing the wind blown in from the window to pass through the wind vent part 2, and while decreasing a fact that the light shielding performance of the curtain is spoiled, it is suppressed that the curtain is fanned by the window and whirled up.