An aspect of the present invention relates to a wavelength conversion member, which comprises a wavelength conversion layer, wherein the wavelength conversion layer comprises at least one quantum dot which has a property of being excited with exciting light to emit fluorescence, and at least one oxygen permeability coefficient-reducing agent, an oxygen permeability coefficient per 1 mm thickness of the wavelength conversion layer is less than 150.0 cm3/m2/day/atm, and the oxygen permeability coefficient-reducing agent is a compound which exhibits an oxygen permeability coefficient-reducing capability of reducing the oxygen permeability coefficient per 1 mm thickness of the wavelength conversion layer by equal to or more than 30% per 10 parts by weight of the oxygen permeability coefficient-reducing agent relative to 100 parts by weight of the wavelength conversion layer except for the oxygen permeability coefficient-reducing agent.