Optical fiber ribbon and optical fiber cable

An optical fiber ribbon comprising:

• a plurality of optical fibers arranged in parallel;
• and
• a connecting resin layer containing a ribbon resin for coating and connecting the plurality of optical fibers,
• wherein each of the plurality of optical fibers has an outer diameter of 220 μm or less;
• each of the plurality of optical fibers includes a glass fiber containing a core and a cladding, a primary resin layer in contact with the glass fiber for coating the glass fiber, and a colored secondary resin layer for coating the primary resin layer;
• the colored secondary resin layer contains a cured product of a resin composition containing 2,4,6-trimethylbenzoyldiphenylphosphine oxide as a photopolymerization initiator;
• and
• a content of phosphorus in the colored secondary resin layer is 0.03 mass % or more and 0.30 mass % or less, and an amount of a phosphorus-tin complex at the surface of the colored secondary resin layer is 300 ppm or more and 7000 ppm or less, and
• wherein the resin composition further contains a polyfunctional monomer having a bisphenol moiety.