The present invention relates to an optical scanning device.;The present invention installs a light transmitting member in a cover assembled on the upper part of the main body, but installs it in a state where it can be disassembled and assembled so that dust and dirt can be easily wiped off so that the surface and the back of the light transmitting member are always clean and the beam In particular, the optical scanning device for improving the transmittance of the light source, the upper body is open, the light source means is installed in the main body to generate a constant beam, and the beam provided in the main body and emitted from the light source means Deflecting means and focusing means for deflecting to form a focus; a cover covering an upper portion of the main body; a light transmitting member formed on an upper portion of the cover and transmitting a beam emitted from the focusing means to the outside; and the light transmitting member. Separation means for separating the from the cover is provided.
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