A light source apparatus includes a light source from which, excitation light is emitted, an optical fiber which is optically connected to the light source, and which guides the excitation light, and a wavelength converting member which is optically connected to an emitting end portion of the optical fiber, and which receives the excitation light emitted from the emitting end portion, and makes emerge light of a wavelength area different from a wavelength area of the excitation light. The light source apparatus has a diverging unit which is arranged in an optical path of the excitation light, between the emitting end portion of the optical fiber and the wavelength converting member, and a holding member for holding the emitting end portion of the optical fiber, the diverging unit, and the wavelength converting member.