Abstract: An object of the invention is to obtain a diffusive reflecting structure showing a desired reflection directivity with ease and stability. The manufacturing method for a diffusive reflecting structure comprises: depositing a photosensitive material (2) on a base layer; masking the photosensitive material (2) using a halftone mask (3) having at least one of transmissive area (31) and light shield area (32) and having a semitransmissive area (33); forming unevenness (21, 22) on a surface of a layer of the photosensitive material by exposing the photosensitive material to light through the mask (3) and developing the material, the unevenness corresponding to peak portions corresponding to the one of the areas (31, 32) and halfway portions corresponding to the semitransmissive area; and depositing an optical reflecting material (4) on the formed uneven surface.