There is provided a pulse shaping device including a pulse generator configured to generate pulsed light by using a semiconductor laser for emitting light of a predetermined wavelength, and an optical member provided in a subsequent stage of the pulse generator and configured to compress a pulse time width of the pulsed light. The pulsed light has a first frequency dispersion state. The optical member imparts a second frequency dispersion state to the pulsed light, the second frequency dispersion state being a frequency dispersion state opposite to the first frequency dispersion state.