The laser processing apparatus includes a first plate and at least one laser unit installed on an upper surface of the first plate, wherein the laser unit includes a second plate formed with a predetermined thickness and a laser emitting laser light. A light output unit, an optical system unit for guiding laser light, and a laser light irradiation unit for irradiating a work with laser light incident through the optical system unit, and at least the laser light output unit and the optical system unit are the second It is provided on the upper surface of the plate, and the second plate is installed on the first plate while the lower surface thereof is in contact with the upper surface of the first plate.
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