[Object] To manufacture a diffuser plate with better productivity, the diffuser plate exhibiting an excellent diffusion property and having excellent durability with respect to light having large coherence. [Solution] The microlens array diffuser plate according to the invention includes a microlens group positioned on a surface of a transparent substrate. The diffuser plate includes two or more unit cells that are continuously set in array, the unit cell includes a plurality of microlenses positioned on the surface of the transparent substrate, and ridge lines between the microlenses adjacent to each other are nonparallel to each other, and are nonparallel to the transparent substrate.