NOVELTY - Producing infrared light reflecting film (21), comprises: coating polymerizable liquid crystal composition including polymerizable cholesteric liquid crystal compound, chiral agent having an helical twisting power (HTP) expression of less than or equal to 50 mu m-1, a monofunctional monomer, and organic solvent on a substrate; aligning polymerizable cholesteric liquid crystal compound by heating to form cholesteric liquid crystal phase; and irradiating the polymerizable liquid crystal composition with actinic radiation to fix cholesteric liquid crystal phase and form infrared light reflecting layer (14b).    USE - The method is useful for producing an infrared light reflecting film which is used: in a window member of a vehicle or a window member of a building structure (claimed); on freezer showcase; as agricultural house material and agricultural reflecting sheet; and as solar cell film.    ADVANTAGE - The method provides infrared light reflecting film which: exhibits excellent brittleness and good haze even when a chiral agent having a low HTP is utilized; and maintains excellent optical characteristics even when the winding and the delivery steps are repeated in the production process and when it is stored or transported in a wound on a roll state.    DETAILED DESCRIPTION - Producing an infrared light reflecting film (21), comprises: coating a polymerizable liquid crystal composition including a polymerizable cholesteric liquid crystal compound, a chiral agent having an helical twisting power (HTP) expression (Refractive index of polymerizable cholesteric liquid crystal compound/( selective reflection wavelength (unit: mu m) of cholesteric liquid crystal phasex mass ratio of chiral agent to polymerizable cholesteric liquid crystal compound)) of less than or equal to 50 mu m-1, a monofunctional monomer, and an organic solvent on a substrate; aligning the polymerizable cholesteric liquid crystal compound by heating to form a cholesteric liquid crystal phase; and irradiating the polymerizable liquid crystal composition with actinic radiation to fix the cholesteric liquid crystal phase and form an infrared light reflecting layer (14b), where the amount of a residual solvent after the alignment step is controlled to greater than or equal to 0.2 g/m2. An INDEPENDENT CLAIM is also included for the infrared light reflecting film produced by the method.    DESCRIPTION OF DRAWING(S) - The figure shows a cross sectional view of the infrared light reflecting film.    Resin film (12)    Infrared light reflecting layer (14b)    Infrared light reflecting film (21)