A cigarette filter inspection method of inspecting a solid flavor element to be disposed in a void between two filter plugs placed in outer filter wrapper, and the cigarette filter inspection method includes an illumination step of irradiating the void with illumination light, an imaging step of obtaining an inspection image of a region containing the void, a filler detection step of detecting the flavor element based on contrast between the void and the flavor element in the inspection image, and an inspection step of inspecting the flavor element detected in the inspection image.

A cigarette filter inspection method of inspecting a solid flavor element to be disposed in a void between two filter plugs placed in outer filter wrapper, and the cigarette filter inspection method includes an illumination step of irradiating the void with illumination light, an imaging step of obtaining an inspection image of a region containing the void, a filler detection step of detecting the flavor element based on contrast between the void and the flavor element in the inspection image, and an inspection step of inspecting the flavor element detected in the inspection image.