A laser processing head comprising: a housing; and a plurality of optical components disposed inside the housing, wherein the housing includes a first light entrance port through which a first laser beam is incident, a second light entrance port through which a second laser beam having a wavelength different from the first laser beam is incident, and a light irradiation port through which the first laser beam and the second laser beam are emitted to an outside, the plurality of optical components include at least a bend mirror that is provided in an optical path of the second laser beam, and reflects the second laser beam to change the optical path, a dichroic mirror that is provided in an optical path of the first laser beam, the dichroic mirror being provided in the optical path of the second laser beam reflected by the bend mirror, an aperture that is provided in the optical paths of the second laser beam transmitted through the dichroic mirror, the aperture being provided in the optical path of the first laser beam reflected by the dichroic mirror, and a detection-side condensing lens that is provided in the optical paths of the first laser beam and the second laser beam transmitted through the aperture, a photodetector is disposed inside the housing, the photodetector being at a position where the first laser beam and the second laser beam transmitted through the detection-side condensing lens are receivable, the dichroic mirror transmits most of the first laser beam to be directed to the light irradiation port, and reflects a rest of the first laser beam to be directed to the aperture, and reflects most of the second laser beam to be directed to the light irradiation port, and transmits a rest of the second laser beam to be directed to the aperture, and the aperture is configured to be able to reduce diameters of the first laser beam and the second laser beam incident on the detection-side condensing lens. a housing; and a plurality of optical components disposed inside the housing, wherein the housing includes a first light entrance port through which a first laser beam is incident, a second light entrance port through which a second laser beam having a wavelength different from the first laser beam is incident, and a light irradiation port through which the first laser beam and the second laser beam are emitted to an outside, a first light entrance port through which a first laser beam is incident, a second light entrance port through which a second laser beam having a wavelength different from the first laser beam is incident, and a light irradiation port through which the first laser beam and the second laser beam are emitted to an outside, the plurality of optical components include at least a bend mirror that is provided in an optical path of the second laser beam, and reflects the second laser beam to change the optical path, a dichroic mirror that is provided in an optical path of the first laser beam, the dichroic mirror being provided in the optical path of the second laser beam reflected by the bend mirror, an aperture that is provided in the optical paths of the second laser beam transmitted through the dichroic mirror, the aperture being provided in the optical path of the first laser beam reflected by the dichroic mirror, and a detection-side condensing lens that is provided in the optical paths of the first laser beam and the second laser beam transmitted through the aperture, a bend mirror that is provided in an optical path of the second laser beam, and reflects the second laser beam to change the optical path, a dichroic mirror that is provided in an optical path of the first laser beam, the dichroic mirror being provided in the optical path of the second laser beam reflected by the bend mirror, an aperture that is provided in the optical paths of the second laser beam transmitted through the dichroic mirror, the aperture being provided in the optical path of the first laser beam reflected by the dichroic mirror, and a detection-side condensing lens that is provided in the optical paths of the first laser beam and the second laser beam transmitted through the aperture, a photodetector is disposed inside the housing, the photodetector being at a position where the first laser beam and the second laser beam transmitted through the detection-side condensing lens are receivable, the dichroic mirror transmits most of the first laser beam to be directed to the light irradiation port, and reflects a rest of the first laser beam to be directed to the aperture, and reflects most of the second laser beam to be directed to the light irradiation port, and transmits a rest of the second laser beam to be directed to the aperture, and transmits most of the first laser beam to be directed to the light irradiation port, and reflects a rest of the first laser beam to be directed to the aperture, and reflects most of the second laser beam to be directed to the light irradiation port, and transmits a rest of the second laser beam to be directed to the aperture, and the aperture is configured to be able to reduce diameters of the first laser beam and the second laser beam incident on the detection-side condensing lens.