There is provided a heat insulating window film disposed on the inside of a window, including at least: a support; and a fibrous conductive particles-containing layer disposed on the support, in which the fibrous conductive particles-containing layer is disposed on a surface of the support on a side opposite to the surface of the window side, and the heat insulating window film contains a near infrared shielding material. The heat insulating window film; a heat insulating window glass; an building material; a window; a building; and a vehicle which are manufactured at low cost, easily manufactured to have a large area, and have excellent visible light transmittance, shielding properties for near infrared light, heat insulating properties, and light resistance are provided.