The present invention relates to a blood vessel inner wall analyzing apparatus provided with a structure for more accurately analyzing components of substances adhered to the inner walls of blood vessels. A blood vessel inner wall analyzing apparatus (1) is provided with illuminating means detecting means and analyzing means. The illuminating means illuminates a light component in a measurement wavelength range of 1957 nm to 2713 nm onto a measured position from an end surface (30b) of a light illuminating fiber (30) inserted into a carotid artery (C). The detecting means receives a light component from a measured position through an end surface (40a) of a light receiving fiber (40) within the carotid artery (C).
