A light source device, comprising: a semiconductor light-emitting device configured to emit excitation light that is coherent; and a wavelength conversion element (530, 530A) which is spaced from the semiconductor light-emitting device, configured to generate fluorescence by converting a wavelength of the excitation light emitted from the semiconductor light-emitting device, and to generate scattered light (93, 93a, 93b) by scattering the excitation light, wherein the wavelength conversion element (530, 530A) includes a support member, and a wavelength converter comprising two or more first wavelength converters disposed on the support member and a second wavelength converter which is disposed around the two or more first wavelength converters to surround the first wavelength converters in a top view of a surface of the support member, wherein the first wavelength converter includes a first emitting region which part of the excitation light enters, and which emits a first emission light, wherein the second wavelength converter includes a second emitting region which another part of the excitation light enters, and which emits a second emission light, wherein the two or more first wavelength converters are a ceramic YAG fluorescent substance and the second wavelength converter a mixture of a transparent bonding material and YAG fluorescent particles, and wherein a ratio of an intensity of the fluorescence to an intensity of the scattered light (93, 93a, 93b) is lower in the second wavelength converter than in the two or more first wavelength converters, wherein a chromaticity coordinate x of the first emission light of the first emitting region and chromaticity coordinate x of the second emission light of the second emitting region are each distributed between 0.2 and 0.4, and wherein the refractive index of the transparent bonding material is different from that of the fluorescent particles. a semiconductor light-emitting device configured to emit excitation light that is coherent; and a wavelength conversion element (530, 530A) which is spaced from the semiconductor light-emitting device, configured to generate fluorescence by converting a wavelength of the excitation light emitted from the semiconductor light-emitting device, and to generate scattered light (93, 93a, 93b) by scattering the excitation light, wherein the wavelength conversion element (530, 530A) includes a support member, and a wavelength converter comprising two or more first wavelength converters disposed on the support member and a second wavelength converter which is disposed around the two or more first wavelength converters to surround the first wavelength converters in a top view of a surface of the support member, wherein the first wavelength converter includes a first emitting region which part of the excitation light enters, and which emits a first emission light, wherein the second wavelength converter includes a second emitting region which another part of the excitation light enters, and which emits a second emission light, wherein the two or more first wavelength converters are a ceramic YAG fluorescent substance and the second wavelength converter a mixture of a transparent bonding material and YAG fluorescent particles, and wherein a ratio of an intensity of the fluorescence to an intensity of the scattered light (93, 93a, 93b) is lower in the second wavelength converter than in the two or more first wavelength converters, wherein a chromaticity coordinate x of the first emission light of the first emitting region and chromaticity coordinate x of the second emission light of the second emitting region are each distributed between 0.2 and 0.4, and wherein the refractive index of the transparent bonding material is different from that of the fluorescent particles.