A laser processing head comprising: a housing ; and a plurality of optical components disposed in the housing , wherein the housing includes a first light entrance port through which a first laser beam (A) enters, a second light entrance port through which a second laser beam (B) enters, a light irradiation port through which the first laser beam (A) and the second laser beam (B) are emitted to an outside, and a partition wall that separates an optical path of the first laser beam (A) entering through the first light entrance port from an optical path of the second laser beam (B) entering through the second light entrance port , the second laser beam (B) has a wavelength shorter than a wavelength of the first laser beam (B), the laser processing head includes a first photodetector provided around the optical path of the first laser beam (A) entering through the first light entrance port , and a second photodetector provided around the optical path of the second laser beam (B) entering through the second light entrance port , the first photodetector is disposed opposite to the second photodetector across the partition wall , the first photodetector receives light in a second wavelength band including the wavelength of the second laser beam (B), the second photodetector receives light in a first wavelength band including the wavelength of the first laser beam (A), and at least some of the plurality of optical components are disposed in the housing to make an optical axis of the first laser beam (A) emitted from the light irradiation port and an optical axis of the second laser beam (B) substantially coincide with each other by changing the optical path of at least one of the first laser beam (A) or the second laser beam (B). a housing ; and a plurality of optical components disposed in the housing , wherein the housing includes a first light entrance port through which a first laser beam (A) enters, a second light entrance port through which a second laser beam (B) enters, a light irradiation port through which the first laser beam (A) and the second laser beam (B) are emitted to an outside, and a partition wall that separates an optical path of the first laser beam (A) entering through the first light entrance port from an optical path of the second laser beam (B) entering through the second light entrance port , the second laser beam (B) has a wavelength shorter than a wavelength of the first laser beam (B), the laser processing head includes a first photodetector provided around the optical path of the first laser beam (A) entering through the first light entrance port , and a second photodetector provided around the optical path of the second laser beam (B) entering through the second light entrance port , the first photodetector is disposed opposite to the second photodetector across the partition wall , the first photodetector receives light in a second wavelength band including the wavelength of the second laser beam (B), the second photodetector receives light in a first wavelength band including the wavelength of the first laser beam (A), and at least some of the plurality of optical components are disposed in the housing to make an optical axis of the first laser beam (A) emitted from the light irradiation port and an optical axis of the second laser beam (B) substantially coincide with each other by changing the optical path of at least one of the first laser beam (A) or the second laser beam (B). <EOS>