A laser machining head includes a protection window disposed inclined with respect to an optical axis of a laser beam, an inflow port disposed downstream of the protection window and configured to allow a gas to flow in, and a flow dividing projection configured to divide the gas into a first laminar flow flowing along parallel to a surface of the protection window and a second laminar flow flowing toward a workpiece. The flow dividing projection is disposed in a position opposing to the inflow port with the optical axis of the laser beam as the center.