| 摘要 |
A laser cutting nozzle configured such that a laser beam is irradiated through a nozzle hole formed in a nozzle main body from an opening of the nozzle hole, and an assist gas surrounding the laser beam is emitted. The nozzle hole includes a first control flow path, a second control flow path, and a third control flow path formed in a coaxial cylindrical shape, in sequence from upstream toward downstream in a flow direction of the assist gas. If a diameter of the first control flow path is &phgr;A, a diameter of the second control flow path is &phgr;B, and a diameter of the third control flow path is &phgr;C, an equation &phgr;A<&phgr;C<&phgr;B is satisfied.
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