An optical component includes: a base material; and an antireflection film, which includes a titanium oxide layer composed mainly of titanium oxide and containing at least one element selected from the group consisting of Nb, Si, Zr, Ta, Al, and Hf as an accessory component, and a silicon oxide layer composed mainly of silicon oxide. The element as the accessory component is preferably an element which constitutes a composite oxide with titanium. The content of the accessory component in the titanium oxide layer is preferably 0.01 mass % or more and 1.0 mass % or less.