A scanning projector , comprising: a light source unit including a plurality of laser light sources; a mirror unit including a plurality of mirrors which transmit or reflect light beams output from the light source unit ; a light synthesizer which synthesizes the light beams transmitted or reflected by the mirror unit ; a Micro-Electro-Mechanical-System, MEMS, scanner which reflects incident light and performs scanning of the light in a horizontal direction and a vertical direction; and a light reflection unit which reflects light, having passed through the light synthesizer , to the MEMS scanner , wherein the light synthesizer includes a 1/2 wavelength plate converting a first polarization of the light beams transmitted or reflected by the mirror unit into a second polarization, and a Polarization Beam Splitter, PBS, surface synthesizing the light beams polarization-converted by the 1/2 wavelength plate into the second polarization with the light beams having the first polarization, wherein the 1/2 wavelength plate is disposed on a front surface of the light synthesizer and the PBS surface is disposed inside the light synthesizer , wherein the light source unit comprises at least five laser diodes including one or more of a red laser diode, a green laser diode, and a blue laser diode; wherein in response to light, corresponding to the first red laser diode, the first green laser diode, and the first blue laser diode, being incident on the 1/2 wavelength plate , light corresponding to the remaining laser diodes is directly incident on the PBS surface ; or in response to light, corresponding to the first red laser diode, the first green laser diode, and the first blue laser diode, being directly incident on the PBS surface , light corresponding to the remaining laser diodes is incident on the 1/2 wavelength plate ; and wherein the 1/2 wavelength plate and the PBS surface are arranged so as to be inclined at 45 degrees. a light source unit including a plurality of laser light sources; a mirror unit including a plurality of mirrors which transmit or reflect light beams output from the light source unit ; a light synthesizer which synthesizes the light beams transmitted or reflected by the mirror unit ; a Micro-Electro-Mechanical-System, MEMS, scanner which reflects incident light and performs scanning of the light in a horizontal direction and a vertical direction; and a light reflection unit which reflects light, having passed through the light synthesizer , to the MEMS scanner , wherein the light synthesizer includes a 1/2 wavelength plate converting a first polarization of the light beams transmitted or reflected by the mirror unit into a second polarization, and a Polarization Beam Splitter, PBS, surface synthesizing the light beams polarization-converted by the 1/2 wavelength plate into the second polarization with the light beams having the first polarization, wherein the 1/2 wavelength plate is disposed on a front surface of the light synthesizer and the PBS surface is disposed inside the light synthesizer , wherein the light source unit comprises at least five laser diodes including one or more of a red laser diode, a green laser diode, and a blue laser diode; wherein in response to light, corresponding to the first red laser diode, the first green laser diode, and the first blue laser diode, being incident on the 1/2 wavelength plate , light corresponding to the remaining laser diodes is directly incident on the PBS surface ; or in response to light, corresponding to the first red laser diode, the first green laser diode, and the first blue laser diode, being directly incident on the PBS surface , light corresponding to the remaining laser diodes is incident on the 1/2 wavelength plate ; and wherein the 1/2 wavelength plate and the PBS surface are arranged so as to be inclined at 45 degrees. <EOS>