Pulsed light generator and pulsed fiber laser

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A pulsed light generator of the invention includes : an excitation light source; a fiber grating into which excitation light from the excitation light source enters; a rare-earth doped optical fiber optically coupled with the fiber grating, in which a rare-earth element is doped into a core, serving as an optical transmitting section; an optical switch including a deflection element for causing a Q-switching operation; a first optical fiber that causes light from the rare-earth doped optical fiber to enter into the optical switch; and a second optical fiber for waveguiding pulsed light output from the optical switch. One surface side of the optical switch, into which light enters, is subjected to anti-reflection treatment with a reflectance with respect to a wavelength of the pulsed light output from the optical switch being 0.1% or less. A low-reflection section having a reflectance with respect to the wavelength of the pulsed light output from the optical switch of from 1% to 60% inclusive, is arranged on an other surface side of the optical switch, from which light is emitted.