An inspection method of a honeycomb structure comprising the steps of illuminating one end face of a honeycomb structure as an inspection target by a light source; condensing, by a condensing lens as a lens having an angle of view, light which is emitted from the light source to the one end face, passed through cells of the honeycomb structure and radiated from the other end face; receiving the light condensed on the condensing lens by a camera; subjecting the light received by the camera to image processing by an image processor, thereby specifying the radiated position of the light on the other end face; and calculating the tilt of the cells of the honeycomb structure from the radiated position of the light on the other end face, and the direction of the tilt.