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.