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.