A living body information imaging apparatus includes a member that is adapted to be introduced into an interior of a living body and has a light irradiation portion for irradiating light with an angle of irradiation equal to or more than 2&pgr steradian to the interior of the living body and a signal detector that is arranged outside the living body and detects a signal output based ON light irradiation in the interior of the living body by the member having the light irradiation portion.
