A method for producing a circularly-polarized light separating sheet, said method comprising: applying a cholesteric liquid crystal composition onto a transparent resin substrate to obtain a liquid crystal layer; and applying at least one step of light irradiation and/or heating to said liquid crystal layer for curing said liquid crystal layer to obtain a cured liquid crystal layer, wherein: the cholesteric liquid crystal composition is a cholesteric liquid crystal composition comprising a nematic liquid crystal compound having a reactive group, and one or more species of chiral agent, wherein said composition has: a Δn value of 0.18 or more, and an absolute value of a temperature dependency parameter δλ of 0.50 or less when a value "a" is 25 and a value "b" is 100, wherein said parameter δλ is calculated by the formula: δλ = 2 ⁢ λb - λa / λb + λa x 100 / b - a wherein "a" and "b" represent temperatures (°C), λa represents a selective reflection center wavelength (nm) of said liquid crystal composition at "a" °C, λb represents a selective reflection center wavelength (nm) of said liquid crystal composition at "b" °C. applying a cholesteric liquid crystal composition onto a transparent resin substrate to obtain a liquid crystal layer; and applying at least one step of light irradiation and/or heating to said liquid crystal layer for curing said liquid crystal layer to obtain a cured liquid crystal layer, wherein: the cholesteric liquid crystal composition is a cholesteric liquid crystal composition comprising a nematic liquid crystal compound having a reactive group, and one or more species of chiral agent, wherein said composition has: a Δn value of 0.18 or more, and an absolute value of a temperature dependency parameter δλ of 0.50 or less when a value "a" is 25 and a value "b" is 100, wherein said parameter δλ is calculated by the formula: δλ = 2 ⁢ λb - λa / λb + λa x 100 / b - a wherein "a" and "b" represent temperatures (°C), λa represents a selective reflection center wavelength (nm) of said liquid crystal composition at "a" °C, λb represents a selective reflection center wavelength (nm) of said liquid crystal composition at "b" °C. the cholesteric liquid crystal composition is a cholesteric liquid crystal composition comprising a nematic liquid crystal compound having a reactive group, and one or more species of chiral agent, wherein said composition has: a Δn value of 0.18 or more, and an absolute value of a temperature dependency parameter δλ of 0.50 or less when a value "a" is 25 and a value "b" is 100, wherein said parameter δλ is calculated by the formula: δλ = 2 ⁢ λb - λa / λb + λa x 100 / b - a wherein "a" and "b" represent temperatures (°C), λa represents a selective reflection center wavelength (nm) of said liquid crystal composition at "a" °C, λb represents a selective reflection center wavelength (nm) of said liquid crystal composition at "b" °C. a Δn value of 0.18 or more, and an absolute value of a temperature dependency parameter δλ of 0.50 or less when a value "a" is 25 and a value "b" is 100, wherein said parameter δλ is calculated by the formula: δλ = 2 ⁢ λb - λa / λb + λa x 100 / b - a wherein "a" and "b" represent temperatures (°C), λa represents a selective reflection center wavelength (nm) of said liquid crystal composition at "a" °C, λb represents a selective reflection center wavelength (nm) of said liquid crystal composition at "b" °C.