Laser processing device and laser processing method using same

A laser processing device, comprising at least:

• a laser oscillator that generates laser light;
• a fiber bundle that is formed by bundling a plurality of optical fibers so as to have a predetermined arrangement relationship;
• a beam control mechanism that is provided in the laser oscillator;
• and
• a plurality of laser light emitting heads that are attached to emission ends of the plurality of optical fibers, respectively, and illuminate the laser light to workpieces, respectively, wherein
• the beam control mechanism includes at least
• a condenser lens that receives the laser light, and condenses the laser light at a predetermined magnification,
• a plurality of optical path changing mechanisms that are provided on an optical path of the laser light, the plurality of optical path changing mechanisms being provided between the condenser lens and an incident end face of the fiber bundle, and changing the optical path of the laser light, and
• a controller that controls operations of the plurality of optical path changing mechanisms,
• wherein the beam control mechanism causes the laser light to be incident on one optical fiber selected from among the plurality of optical fibers, and causes the laser light to be emitted from the laser light emitting head attached to the one optical fiber.