A window article, a blind, a roll curtain or a Japanese Shoji screen comprising an optical element, the optical element comprising: an optical layer having an incident surface on which light is incident; and a wavelength-selective reflective film formed in the optical layer, the optical layer including a first optical layer formed on a first main surface of the wavelength-selective reflective film and a second optical layer formed on a second main surface of the wavelength-selective reflective film, wherein the optical element selectively directionally reflects light (L 1) in a specific wavelength range while transmitting light (L 2) in a wavelength range other than the specific wavelength range, the optical element having transparency to the light (L 2) in the wavelength range other than the specific wavelength range so that light absorption and light scattering are absent, wherein the light (L 1) in the specific wavelength range selectively directionally reflected is near infrared light having a wavelength of from 780 to 2,100 nm and the light (L 2) in the wavelength range other than the specific wavelength range is visible light having a wavelength of from 380 to 780 nm, wherein the wavelength-selective reflective film has a shape in which columnar surfaces extending in one direction are one-dimensionally arranged; and of light incident on the incident surface at an incident angle θ, φ, where θ: the angle between a normal (I 1) to the incident surface and incident light incident on the incident surface or reflected light (L 1) exiting from the incident surface; and φ: the angle between a line perpendicular to ridges of the columnar surfaces in the incident surface and a component of the incident light or the reflected light (L 1) projected on the incident surface, the optical element selectively directionally reflects the light (L 1) in the specific wavelength range in a direction other than specular reflection -θ, φ + 180° while transmitting the light (L 2) in the wavelength range other than the specific wavelength range, and the optical element selectively directionally reflects the light (L 1) in the specific wavelength range in a θo, -φ direction, where 0° < θo < 90°, while transmitting the light in the wavelength range other than the specific wavelength range. an optical layer having an incident surface on which light is incident; and a wavelength-selective reflective film formed in the optical layer, the optical layer including a first optical layer formed on a first main surface of the wavelength-selective reflective film and a second optical layer formed on a second main surface of the wavelength-selective reflective film, wherein the optical element selectively directionally reflects light (L 1) in a specific wavelength range while transmitting light (L 2) in a wavelength range other than the specific wavelength range, the optical element having transparency to the light (L 2) in the wavelength range other than the specific wavelength range so that light absorption and light scattering are absent, wherein the light (L 1) in the specific wavelength range selectively directionally reflected is near infrared light having a wavelength of from 780 to 2,100 nm and the light (L 2) in the wavelength range other than the specific wavelength range is visible light having a wavelength of from 380 to 780 nm, wherein the wavelength-selective reflective film has a shape in which columnar surfaces extending in one direction are one-dimensionally arranged; and of light incident on the incident surface at an incident angle θ, φ, where θ: the angle between a normal (I 1) to the incident surface and incident light incident on the incident surface or reflected light (L 1) exiting from the incident surface; and φ: the angle between a line perpendicular to ridges of the columnar surfaces in the incident surface and a component of the incident light or the reflected light (L 1) projected on the incident surface, the optical element selectively directionally reflects the light (L 1) in the specific wavelength range in a direction other than specular reflection -θ, φ + 180° while transmitting the light (L 2) in the wavelength range other than the specific wavelength range, and the optical element selectively directionally reflects the light (L 1) in the specific wavelength range in a θo, -φ direction, where 0° < θo < 90°, while transmitting the light in the wavelength range other than the specific wavelength range.