WINDOW FILM AND DAYLIGHTING TOOL

摘要

PROBLEM TO BE SOLVED: To effectively suppress heat storage of a window film that includes a black material and that can exert a light blocking function.SOLUTION: A window film 10 is used by being superposed on a window material 50. The window film 10 includes a plurality of first parts 20 that are arrayed in a first direction d1 along a film surface of the window film, and a plurality of second parts 25 that are arrayed in such a manner as to be alternating with the first parts in the first direction. The first part is elongated in a second direction d2 non-parallel to the first direction and along a film surface of the window film. The second part includes a diathermanous black material.