A light-source device (20, 100, 201, 202, 203), comprising: an excitation light source configured to emit excitation light being a first color light; an optical member (102, 24, 241) having a reflecting surface configured to reflect the first color light emitted from the excitation light source; a wavelength conversion unit including a wavelength conversion member (103, 26D, 261D) on which the first color light reflected by the optical member is incident, the wavelength conversion member being configured to convert at least part of the first color light into second color light having a wavelength different from a wavelength of the first color light and emit the second color light, a first optical system; a second optical system, the first optical system and the second optical system being disposed in an order of the first optical system and the second optical system from a side of the excitation light source on an optical path between the excitation light source and the wavelength conversion unit; and a refractive optical system and a light mixing element that are disposed in that order on an optical path of the first color light reflected by the wavelength conversion unit and the second color light emitted from the wavelength conversion unit, wherein a center of the first color light on the reflecting surface of the optical member does not intersect with a light flux of the first color light emitted from the wavelength conversion unit; characterised in that a light condensing point of excitation light reflected by the wavelength conversion unit is between the second optical system and the refractive optical system. an excitation light source configured to emit excitation light being a first color light; an optical member (102, 24, 241) having a reflecting surface configured to reflect the first color light emitted from the excitation light source; a wavelength conversion unit including a wavelength conversion member (103, 26D, 261D) on which the first color light reflected by the optical member is incident, the wavelength conversion member being configured to convert at least part of the first color light into second color light having a wavelength different from a wavelength of the first color light and emit the second color light, a first optical system; a second optical system, the first optical system and the second optical system being disposed in an order of the first optical system and the second optical system from a side of the excitation light source on an optical path between the excitation light source and the wavelength conversion unit; and a refractive optical system and a light mixing element that are disposed in that order on an optical path of the first color light reflected by the wavelength conversion unit and the second color light emitted from the wavelength conversion unit, wherein a center of the first color light on the reflecting surface of the optical member does not intersect with a light flux of the first color light emitted from the wavelength conversion unit; characterised in that a light condensing point of excitation light reflected by the wavelength conversion unit is between the second optical system and the refractive optical system.