Provided are: a window material and a light-transparent roof material which can autonomously change the cloudiness thereof in accordance with temperature, have an uncomplicated structure, and can be easily manufactured; a building comprising the window material and/or the light-transparent roof material; and a corresponding vehicle, ship, or aircraft. The window material or the light-transparent roof material according to the present invention comprises at least one light-transparent base material layer and at least one adhesive layer, wherein: the adhesive layer is formed from an adhesive composition containing 1 to 100 parts by mass of polymer fine particles with respect to 100 parts by mass of a thermosensitive adhesive; the refractive index of the thermosensitive adhesive increases as the temperature decreases, with the rate of increase in the refractive index being greater in the vicinity of the melting point of the thermosensitive adhesive than in a temperature range other than the vicinity of the melting point; and the adhesive power of the adhesive composition decreases as the temperature decreases, with the rate of decrease in the adhesive power being greater in the vicinity of the melting point of the thermosensitive adhesive than in the temperature range other than the vicinity of the melting point.