A laser machining apparatus comprising: a laser oscillator configured to output a laser beam (Ls); a laser machining head including a housing; wherein the housing comprises an upstream housing, an aperture, a collimate lens, a bend mirror and a focusing lens being arranged from the upstream housing, with the collimate lens into which the laser beam (Ls) output from the laser oscillator is entered; with the focusing lens into which the laser beam (Ls) is entered and which focuses the laser beam (Ls); a first optical element and a second optical element configured to change a beam profile of a luminous flux of laser beams (Ls) output from the laser oscillator and supplied into the housing to a first beam profile and a second beam profile, respectively; and being characterised by: a selector driving member provided in the housing, being disposed between the aperture and the collimate lens, and including a first mode switch unit and a second mode switch unit arranged at a same position in a direction of an optical axis of the laser beam (Ls) and opposite positions in a radial direction across the optical axis, the first mode switch unit being configured to move the first optical element between a first advanced position where the first optical element is advanced into the luminous flux and a first retracted position where the first optical element is retracted from the luminous flux in a radial direction of the optical axis, the second mode switch unit being configured to move the second optical element between a second advanced position where the second optical element is advanced into the luminous flux and a second retracted position where the second optical element is retracted from the luminous flux toward an opposite side in the radial direction across the optical axis from the first retracted position; and a control device configured to operate the first mode switch unit and the second mode switch unit to maintain the first optical element and the second optical element at the first retracted position and the second retracted position, respectively, a second mode to maintain the first optical element at the first advanced position and the second optical element at the second retracted position, and a third mode to maintain the first optical element at the first retracted position and the second optical element at the second advanced position, the control device being configured to stop the output of the laser beam (Ls) when the first optical element and the second optical element move between the advanced positions and the retracted positions. a laser oscillator configured to output a laser beam (Ls); a laser machining head including a housing; wherein the housing comprises an upstream housing, an aperture, a collimate lens, a bend mirror and a focusing lens being arranged from the upstream housing, with the collimate lens into which the laser beam (Ls) output from the laser oscillator is entered; with the focusing lens into which the laser beam (Ls) is entered and which focuses the laser beam (Ls); a first optical element and a second optical element configured to change a beam profile of a luminous flux of laser beams (Ls) output from the laser oscillator and supplied into the housing to a first beam profile and a second beam profile, respectively; and being characterised by: a selector driving member provided in the housing, being disposed between the aperture and the collimate lens, and including a first mode switch unit and a second mode switch unit arranged at a same position in a direction of an optical axis of the laser beam (Ls) and opposite positions in a radial direction across the optical axis, the first mode switch unit being configured to move the first optical element between a first advanced position where the first optical element is advanced into the luminous flux and a first retracted position where the first optical element is retracted from the luminous flux in a radial direction of the optical axis, the second mode switch unit being configured to move the second optical element between a second advanced position where the second optical element is advanced into the luminous flux and a second retracted position where the second optical element is retracted from the luminous flux toward an opposite side in the radial direction across the optical axis from the first retracted position; and a control device configured to operate the first mode switch unit and the second mode switch unit to maintain the first optical element and the second optical element at the first retracted position and the second retracted position, respectively, a second mode to maintain the first optical element at the first advanced position and the second optical element at the second retracted position, and a third mode to maintain the first optical element at the first retracted position and the second optical element at the second advanced position, the control device being configured to stop the output of the laser beam (Ls) when the first optical element and the second optical element move between the advanced positions and the retracted positions.