A multi-beam laser scanning unit including a plurality of laser diodes arranged in the vertical direction, and a plurality of collimating lens units having collimating lenses, which are arranged in the laser beam optical path in order to convert laser beams emitted from each of the laser diodes into linear beams. The collimating lens units are arranged in a manner such that adjacent collimating lens units are partly overlapped in the laser beam scanning direction. Each of the collimating lenses has a different focal length.

 
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