WINDOW FILM AND NATURAL LIGHTING TOOL

摘要

PROBLEM TO BE SOLVED: To effectively restrain heat from locally transmitting to a window material laminated on a window film capable of absorbing a heat ray.SOLUTION: A window film 10 is a film used by being laminated on a window material 50. The window film comprises a light control layer 11 and a heat transmission layer 60 laminated on the light control layer and having heat conductivity of 10 W/m.k or more. The light control layer 11 includes a plurality of first parts 20 arranged in the first direction d1 along a film surface of the window film and a plurality of second parts 25 alternately arranged in the first direction with the first parts. The first parts are non-parallel to the first direction, and extend in the second direction d2 along the film surface of the window film.