An anisotropic light diffusion adhesive layer containing an adhesive and needle fillers having a refractive index different from that of the adhesive wherein the needle fillers are so dispersed as to have a generally uniform orientation is disclosed. The needle fillers are preferably achromic or white. An anisotropic light diffusion adhesive laminate can be formed by piling up and bonding a plurality of the anisotropic light diffusion adhesive layers. The anisotropic light diffusion adhesive layer and the anisotropic light diffusion adhesive laminate are preferably used as an illuminating device such as a backlight device of a liquid crystal display.
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