The purpose of the present invention is to provide an optical-semiconductor-device-sealing sheet that is suitable for the manufacture of a mini/micro-LED display element or other self-light-emitting display device in which color cast is reduced while contrast and the anti-reflective functions of a metal wire are improved. This optical-semiconductor-device-sealing sheet 10 comprises a diffusion layer 1 and an anti-reflective layer 2. The diffusion layer 1 is a resin layer, and the anti-reflective layer 2 is a resin layer. The diffusion layer 1 contains light-diffusing fine particles, and the anti-reflective layer 2 contains a colorant.

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