An indoor cable 1 is composed of an optical fiber core 3, tension members 7, an outer sheath 11, and so forth. The optical fiber core 3 and the tension members 7 are integrated by the outer sheath 11. The outer sheath is composed of a transparent material. The optical fiber core 3 comprises a glass wire and a resin coating (a primary resin layer and a secondary resin layer). The optical fiber core 3 of the present invention does not have a colored layer that is conventionally formed on the outer periphery of the resin coating layer. That is, the optical fiber core 3 is composed entirely of transparent materials. On both sides of the optical fiber core 3, separate from the optical fiber core 3, is arranged a pair of tension members 7. The tension members 7 are composed of transparent materials.