A reflection imaging device includes a first component board, a second component board, and flat plates. The first component board includes first planar reflectors perpendicular to a plate surface and first light transmissive bases extending parallel to the first planar reflectors. The first planar reflectors and the first light transmissive bases are alternately arranged. The second component board includes an inner plate surface bonded to an inner plate surface of the first component board opposed thereto. The second component board includes second planar reflectors perpendicular to the plate surface and the first planar reflectors and second light transmissive bases extending parallel to the second planar reflectors. The second planar reflectors and the second light transmissive bases are alternately arranged. The flat plates are bonded to the outer plate surfaces of at least one of the first component board and the second component board opposed thereto.