Provided are: amorphous epoxy-based fibers having excellent dimensional stability; a fibrous structure at least including the fibers; and a molded object obtained by melting the fibers. The amorphous epoxy-based fibers have a birefringence of 0.005 or less. For example, the amorphous epoxy-based fibers may comprise an amorphous epoxy-based resin represented by the general formula. The amorphous epoxy-based fibers may have an average single-fiber diameter of 40 μm or less. (In the formula, X is a residue of a dihydric phenol and n is 20 or greater.)
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