A light emitting substrate comprising: a phosphor substrate ; and a plurality of light emitting elements mounted on a front face of the phosphor substrate and being formed as a chip sized package, CSP, the light emitting elements comprising a light emitting diode, LED, being covered with a phosphor sealing layer comprising a first phosphor, the phosphor substrate comprising: an insulating substrate ; an electrode layer which is disposed on a front face of the insulating substrate and includes a plurality of electrode pairs bonded to the plurality of light emitting elements ; and a phosphor layer which is disposed on the front face of the insulating substrate to form the front face of the phosphor substrate and includes a second phosphor in which a light emission peak wavelength, in a case where light emitted by the light emitting element is used as excitation light, is in a visible light region, wherein the insulating substrate contains a bismaleimide resin and glass cloth, and the phosphor layer is disposed on a portion of the front face of the insulating substrate and the electrode layer other than the plurality of electrode pairs , and the region of the front face of the insulating substrate where the phosphor layer is disposed is a region that is equal to or more than 80% of the front face of the insulating substrate . a phosphor substrate ; and a plurality of light emitting elements mounted on a front face of the phosphor substrate and being formed as a chip sized package, CSP, the light emitting elements comprising a light emitting diode, LED, being covered with a phosphor sealing layer comprising a first phosphor, the phosphor substrate comprising: an insulating substrate ; an electrode layer which is disposed on a front face of the insulating substrate and includes a plurality of electrode pairs bonded to the plurality of light emitting elements ; and a phosphor layer which is disposed on the front face of the insulating substrate to form the front face of the phosphor substrate and includes a second phosphor in which a light emission peak wavelength, in a case where light emitted by the light emitting element is used as excitation light, is in a visible light region, wherein the insulating substrate contains a bismaleimide resin and glass cloth, and the phosphor layer is disposed on a portion of the front face of the insulating substrate and the electrode layer other than the plurality of electrode pairs , and the region of the front face of the insulating substrate where the phosphor layer is disposed is a region that is equal to or more than 80% of the front face of the insulating substrate . an insulating substrate ; an electrode layer which is disposed on a front face of the insulating substrate and includes a plurality of electrode pairs bonded to the plurality of light emitting elements ; and a phosphor layer which is disposed on the front face of the insulating substrate to form the front face of the phosphor substrate and includes a second phosphor in which a light emission peak wavelength, in a case where light emitted by the light emitting element is used as excitation light, is in a visible light region, wherein the insulating substrate contains a bismaleimide resin and glass cloth, and the phosphor layer is disposed on a portion of the front face of the insulating substrate and the electrode layer other than the plurality of electrode pairs , and the region of the front face of the insulating substrate where the phosphor layer is disposed is a region that is equal to or more than 80% of the front face of the insulating substrate . <EOS>