Diffusion member, stacked body, diffusion member set, LED backlight, and displaying apparatus

1. A diffusion member comprising a first layer and a second layer, in this order, wherein

the first layer has a light transmissivity and a light diffusivity, and

the second layer is a dielectric multi-layer in which a reflectance of light increases as an absolute value of an incident angle with respect to a first layer side surface of the second layer decreases, and a transmittance of light increases as an absolute value of an incident angle with respect to a first layer side surface of the second layer increases.

2. The diffusion member according to claim 1 , wherein the first layer is a transmission type diffractive grating or a microlens array.

3. The diffusion member according to claim 1 , wherein the first layer is placed on one surface of the second layer directly, or via an adhesive layer or a pressure-sensitive adhesive layer.

4. The diffusion member according to claim 1 , wherein the first layer in a pattern form is placed on one surface of the second layer.

5. The diffusion member according to claim 1 , wherein the first layer is placed on one surface of the second layer via a void portion.

6. A stacked body comprising:

the diffusion member according to claim 1 , and

a sealing material sheet placed on a first layer side surface of the diffusion member, and configured to seal an LED element,

wherein the sealing material sheet includes a sealing material composition containing a thermoplastic resin.

7. The stacked body according to claim 6 , wherein the thermoplastic resin is an olefin based resin.