A light transmitting body characterized in that an optical fiber (10) having a core (12) of a quartz-based glass having a graded index refractive index distribution, and a cladding (13) formed on the outer surface of the core (12) is used while being bent by a quarter of turn or more with a radius of curvature of 4-10 mm. Consequently, there can be obtained a light transmitting body employing a GI type optical fiber which enables to facilitate wiring in a limited space such as wiring in an apparatus, while improving optical communication band.