A lighting device, comprising: an excitation light source unit that supplies excitation light; a phosphor unit that emits fluorescent light by excitation caused by excitation light supplied from said excitation light source unit; a collimator lens in front of the phosphor unit that converts fluorescent light emitted from said phosphor unit to parallel luminous flux; a first solid-state light source that supplies first light whose peak wavelength is set in a first wavelength band in which wavelengths are longer than the wavelength of fluorescent light emitted from said phosphor unit; a second solid-state light source that supplies second light whose peak wavelength is set in a second wavelength band that differs from said first wavelength band; a dichroic mirror in which excitation light supplied from said excitation light source unit and light supplied from said first solid-state light source are combined and exited as a combined light; and color-combining means that is provided with first to fourth side surfaces (20a-d) and internal first film to second film that are arranged such that the film surfaces intersect XX with each other; wherein said first film transmits red light and reflects blue light and excitation light; wherein said second film reflects red light and transmits blue light and excitation light; in such a way that combined light by said dichroic mirror is supplied to said first surface, and from said combined light said excitation light being exited toward said phosphor unit from said second surface said first light being exited from said fourth surface, said fluorescent light emitted from said phosphor unit being supplied to said second surface and exited from said fourth surface, said second light that was supplied from said second solid-state light source is supplied to said third surface, and exited from said fourth surface; wherein said collimator lens condenses said excitation light exited from said second surface of said color-combining means on said phosphor unit. an excitation light source unit that supplies excitation light; a phosphor unit that emits fluorescent light by excitation caused by excitation light supplied from said excitation light source unit; a collimator lens in front of the phosphor unit that converts fluorescent light emitted from said phosphor unit to parallel luminous flux; a first solid-state light source that supplies first light whose peak wavelength is set in a first wavelength band in which wavelengths are longer than the wavelength of fluorescent light emitted from said phosphor unit; a second solid-state light source that supplies second light whose peak wavelength is set in a second wavelength band that differs from said first wavelength band; a dichroic mirror in which excitation light supplied from said excitation light source unit and light supplied from said first solid-state light source are combined and exited as a combined light; and color-combining means that is provided with first to fourth side surfaces (20a-d) and internal first film to second film that are arranged such that the film surfaces intersect XX with each other; wherein said first film transmits red light and reflects blue light and excitation light; wherein said second film reflects red light and transmits blue light and excitation light; in such a way that combined light by said dichroic mirror is supplied to said first surface, and from said combined light said excitation light being exited toward said phosphor unit from said second surface said first light being exited from said fourth surface, said fluorescent light emitted from said phosphor unit being supplied to said second surface and exited from said fourth surface, said second light that was supplied from said second solid-state light source is supplied to said third surface, and exited from said fourth surface; wherein said collimator lens condenses said excitation light exited from said second surface of said color-combining means on said phosphor unit.