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Abstract

An optical fiber according to the present disclosure includes: a glass fiber including a core and a cladding; and a coating resin layer covering the glass fiber, in which the coating resin layer includes a cured product of a resin composition containing a photopolymerizable compound and a phosphine oxide-based photopolymerization initiator, and trimethylbenzoic acid, a content of the phosphine oxide-based photopolymerization initiator is 0.001% by mass or more and 0.5% by mass or less based on a total amount of the optical fiber, and a content of trimethylbenzoic acid is 0.001% by mass or more and 0.2% by mass or less based on the total amount of the optical fiber.

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First Claim