| 摘要 |
Provided is a laser beam machining apparatus (1) which enables prevention of a reduction in the transmittance of a protection glass (32) caused by adhesion of high-temperature foreign substances such as spatters and fumes generated in laser beam machining to thereby increase the useful life of the protection glass (32). The laser beam machining apparatus (1) performs machining by melting the surface of a workpiece (2) by irradiating the surface of the workpiece (2) with a laser beam. The laser machining apparatus is provided with a condenser lens (31) for condensing the laser beam onto the surface of the workpiece (2), the protection glass (32) for protecting the condenser lens (31), which is disposed on the workpiece (2) side of the condenser lens (31), a torch (34) for emitting the laser beam, which is disposed facing the workpiece (2), and an assist gas feeding unit (40) (cooling means) for cooling the protection glass (32).
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