Optical fiber unit and optical fiber cable

An optical fiber unit, comprising:

• an optical fiber ribbon in which a plurality of optical fibers are arranged in parallel and connected to each other;
• a colored bundle tape longitudinally wrapped around an optical fiber ribbon bundle in which a plurality of the optical fiber ribbons are stranded together;
• and
• a colored bundle yarn spirally wound around the optical fiber ribbon bundle and the bundle tape, wherein
• the colored bundle tape covers a whole periphery of the optical fiber ribbon bundle in a range of 25% or more and 100% or less,
• the colored bundle tape covers a given area of the optical fiber ribbon bundle, and
• the given area is 50% or more and 100% or less of the entire circumference of the optical fiber ribbon bundle in a cross sectional view.