A laser cutting nozzle (51) includes an inner nozzle (1) and an outer nozzle (11). The inner nozzle (1) exhibits a tube shape having a through hole (2) on an axis (CL1) and having a diameter decreasing on a first end portion side and includes a notch (1a1 to 1a3) extending in the axis (CL1) direction along an outer peripheral surface on a second end portion side. The outer nozzle (11) is fitted to the outer peripheral surface of the inner nozzle (1) and includes a vent passage (GR) including the notch (1a1 to 1a3) and communicating between the first end portion and the second end portion in the axis (CL1) direction. A minimum flow cross-sectional area (Smin) of the vent passage (GR) matches an opening area of the notch (1a1 to 1a3) in an end surface on the second end portion side.
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