Optical component, illumination device, and display device

An object of the present invention is to improve the brightness of emitted light and suppress side lobes and moire interference fringes. An optical component includes a substantially hemispherical micro lens and a triangular prism lens on a first main surface of a base. A plurality of prism lenses 15 are arranged in one direction. The aspect ratio TL2 / TM1 of the height of the prism lens 15 and the microlens 15 is set from 10% to 90% with the first main surface 13a as a reference. The area ratio Mb / Ma of the microlens 15 with respect to the first major surface 13a in a plan view is 25% to 88%. On the second main surface 13b of the base material 13, the third convex portions 18 made of microlenses are randomly provided to improve the diffusibility of incident light. [Selection] Figure 1