Disclosed is a laser device which can emit light having first and second wavelengths, having the advantage of increasing laser efficiency without causing an increase in cost. A flash lamp irradiates excitation light onto a laser rod. An optical resonator includes a pair of mirrors facing each other with the laser rod interposed therebetween. A wavelength switching unit includes a long path filter which transmits light having a wavelength equal to or greater than a first wavelength. The wavelength switching unit inserts the long path filter on the optical path of the optical resonator when the wavelength of laser light to be emitted is the first wavelength.
