A measuring apparatus includes a first laser light source for emitting laser light of a first wavelength, a second laser light source for emitting laser light of a second wavelength different from the first wavelength, an optical detector for receiving scattered laser light from a measured part, and a controller configured to calculate a first value based on an output of the optical detector that is based on received scattered laser light of the first wavelength, calculate a second value based on an output of the optical detector that is based on received scattered laser light of the second wavelength, and measure oxygen saturation based on a ratio of the first value to the second value.