To provide a laser beam machining apparatus which can improve the production efficiency while preventing the leakage of laser beams, and a laser beam machining method.

A laser beam machining apparatus 1 includes a laser beam irradiation device 2 which applies laser beams to a workpiece W to machine the workpiece W, and a workpiece machining chamber 4 which houses a laser beam irradiation device 2 and prevents laser beams applied from the laser beam irradiation device 2 from being leaked to the outside of the laser beam machining apparatus 1. A first carrying-in/carrying-out port 45 through which the workpiece W is passed is provided in the floor F of the workpiece machining chamber 4. The laser beam machining apparatus 1 further includes a workpiece carrying-in/carrying-out device 6 that carries the workpiece W in the workpiece machining chamber 4 through the first carrying-in/carrying-out port 45 from the outside of the workpiece machining chamber 4 and carries out the workpiece W from the workpiece machining chamber 4 to the outside of the workpiece machining chamber 4.