A laser machining apparatus, comprising: a machining head configured to emit a laser beam for cutting a sheet metal of stainless steel; a moving mechanism (22, 23) configured to relatively move the machining head with respect to a surface of the sheet metal; a beam vibrating mechanism configured to vibrate the laser beam in both a parallel direction with a cutting advancing direction of the sheet metal and an orthogonal direction orthogonal to the cutting advancing direction when the sheet metal is cut by the machining head being relatively moved by the moving mechanism (22, 23); and a control device configured to control the moving mechanism (22, 23) and the beam vibrating mechanism, characterized in that the control device controls the beam vibrating mechanism to vibrate the laser beam in a C-shaped vibration pattern, as a vibration pattern of the laser beam by only the beam vibrating mechanism, the vibration pattern including no movement of the laser beam by relative movement of the machining head, in which a beam spot (Bs) on the surface of the sheet metal is moved from a first irradiation position at a front end in the cutting advancing direction to a second irradiation position at a rear side in the cutting advancing direction and displaced in an orthogonal direction to the cutting advancing direction, and is moved from the second irradiation position to a third irradiation position at a front end in the cutting advancing direction and displaced in an orthogonal direction to the cutting advancing direction, and movement from the first irradiation position to the third irradiation position via the second irradiation position, and movement from the third irradiation position to the first irradiation position via the second irradiation position are repeated, and performs control to cut the sheet metal by causing a beam spot (Bs) in the first irradiation position, a beam spot (Bs) in the second irradiation position, and a beam spot (Bs) in the third irradiation position to overlap one another, when the machining head is relatively moved by the moving mechanism (22, 23) while the laser beam is vibrated in the C-shaped vibration pattern. a machining head configured to emit a laser beam for cutting a sheet metal of stainless steel; a moving mechanism (22, 23) configured to relatively move the machining head with respect to a surface of the sheet metal; a beam vibrating mechanism configured to vibrate the laser beam in both a parallel direction with a cutting advancing direction of the sheet metal and an orthogonal direction orthogonal to the cutting advancing direction when the sheet metal is cut by the machining head being relatively moved by the moving mechanism (22, 23); and a control device configured to control the moving mechanism (22, 23) and the beam vibrating mechanism, characterized in that the control device controls the beam vibrating mechanism to vibrate the laser beam in a C-shaped vibration pattern, as a vibration pattern of the laser beam by only the beam vibrating mechanism, the vibration pattern including no movement of the laser beam by relative movement of the machining head, in which a beam spot (Bs) on the surface of the sheet metal is moved from a first irradiation position at a front end in the cutting advancing direction to a second irradiation position at a rear side in the cutting advancing direction and displaced in an orthogonal direction to the cutting advancing direction, and is moved from the second irradiation position to a third irradiation position at a front end in the cutting advancing direction and displaced in an orthogonal direction to the cutting advancing direction, and movement from the first irradiation position to the third irradiation position via the second irradiation position, and movement from the third irradiation position to the first irradiation position via the second irradiation position are repeated, and performs control to cut the sheet metal by causing a beam spot (Bs) in the first irradiation position, a beam spot (Bs) in the second irradiation position, and a beam spot (Bs) in the third irradiation position to overlap one another, when the machining head is relatively moved by the moving mechanism (22, 23) while the laser beam is vibrated in the C-shaped vibration pattern.