A grounding structure of an optical fiber cable that includes a sheath, a plurality of optical fibers housed in the sheath, and a first tension member and a second tension member embedded in the sheath so as to interpose the optical fibers therebetween in a radial direction includes: a conductive member that electrically connects a first extending portion of the first tension member and a second extending portion of the second tension member. The first extending portion and the second extending portion extends from an end portion of the sheath. A length of the second extending portion in a longitudinal direction of the optical fiber cable is greater than a length of the first extending portion in the longitudinal direction. The second extending portion is held by a tension member holding portion and is electrically connected to a grounding circuit.