Abstract: A laser measuring device maintains high responsivity irrespective of changes in surrounding environment, provides more correct measurement and long distance measurement due to reduced noise, and ensures the safety and reliability of a product. A first light emitter emits first wavelength light having a first wavelength. A second light emitter emits second wavelength light having a second wavelength, the second light emitter being arranged perpendicular to the first light emitter. An optical mirror allows one of the first wavelength light and the second wavelength light to pass but reflecting the other one. A first band pass filter for allows the first wavelength light to pass. A second band pass filter allows the second wavelength light to pass. A light receiver receives incident light, which arrives through one of the first and second band pass filters. A controller activates at least one of the first and second light emitters.