To provide an inexpensive light transmission tube which emits light having high luminance while having directivity from its lateral peripheral surface, maintains an excellent light transmission characteristic in spite of adhesion of stains, etc., and has excellent mass productivity and which is capable of releasing high-luminance light toward all bearings.

This light transmission tube 1 has a tubular clad 3 and a core 2 composed of a material having the refractive index higher than the refractive index of this clad material, is formed with belt-like reflection layers 4 extending in the longitudinal direction thereof between the tubular clad 3 and the core 2 to a spiral shape and is constituted to reflect and scatter the light passing the core 2 by these reflection layers 4 and to release the light spirally from the outer peripheral surface of the tubular clad 3 on the side opposite to the side formed with the reflection layers. The light transmission tube is produced by using a multicolor extruder, introducing the core material, the clad material and the reflection materials contg. while pigments or scattering materials into the respective mouthpiece parts of the extruder and respectively simultaneously extruding the core material to a columnar shape, the reflection materials to belt forms on the outer peripheral surface of the columnar core material and the clad material to a tubular form covering the core material and the reflection materials, then taking off the extrude while twisting the extrudate.