A light source device comprising: a first excitation light source configured to emit first excitation light having a wavelength in a first wavelength region; a first optical member (112; 119) configured to absorb at least part of the first excitation light, convert a wavelength of the part of the first excitation light to emit first wavelength converted light, and increase divergence angle of transmitted first excitation light by a first incremental angle; a second optical member disposed in a region including at least an area which includes an optical axis of the first excitation light, light intensity regarding the first excitation light in the area being equal to or more than 1/e times (e is Napier's constant) light intensity on the optical axis, and the second optical member increasing the divergence angle of the transmitted first excitation light by a second incremental angle larger than the first incremental angle; and a holding member which holds the first optical member and the second optical member, characterized in that: the second optical member includes a powder fluorescent material dispersed in a transparent member which transmits light, the powder fluorescent material absorbs light having a wavelength in a second wavelength region different from the first wavelength region, and converts the wavelength of the light having the wavelength in the second wavelength region to emit second wavelength converted light, and the holding member comprises an inner surface which reflects part of the emitted first wavelength converted light and part of the second wavelength converted light. a first excitation light source configured to emit first excitation light having a wavelength in a first wavelength region; a first optical member (112; 119) configured to absorb at least part of the first excitation light, convert a wavelength of the part of the first excitation light to emit first wavelength converted light, and increase divergence angle of transmitted first excitation light by a first incremental angle; a second optical member disposed in a region including at least an area which includes an optical axis of the first excitation light, light intensity regarding the first excitation light in the area being equal to or more than 1/e times (e is Napier's constant) light intensity on the optical axis, and the second optical member increasing the divergence angle of the transmitted first excitation light by a second incremental angle larger than the first incremental angle; and a holding member which holds the first optical member and the second optical member, characterized in that: the second optical member includes a powder fluorescent material dispersed in a transparent member which transmits light, the powder fluorescent material absorbs light having a wavelength in a second wavelength region different from the first wavelength region, and converts the wavelength of the light having the wavelength in the second wavelength region to emit second wavelength converted light, and the holding member comprises an inner surface which reflects part of the emitted first wavelength converted light and part of the second wavelength converted light. the second optical member includes a powder fluorescent material dispersed in a transparent member which transmits light, the powder fluorescent material absorbs light having a wavelength in a second wavelength region different from the first wavelength region, and converts the wavelength of the light having the wavelength in the second wavelength region to emit second wavelength converted light, and the holding member comprises an inner surface which reflects part of the emitted first wavelength converted light and part of the second wavelength converted light.