Unidad de fibra óptica y cable de fibra óptica

The present invention provides an optical fiber unit including a plurality of optical fibers, and at least two binding materials that bind the plurality of optical fibers, the two binding materials are wound around the plurality of optical fibers in an SZ shape, and are adhered to each other at respective reversed portions to form an adhesive part, the adhesive part extends along a longitudinal direction in which the optical fiber unit extends, and when a length of the adhesive part in the longitudinal direction is L, and a binding pitch of the binding material in the longitudinal direction is P, 0.15 ≤ L/(P/2) ≤ 0.8 is satisfied.