Abstract: Light distributing members (1) are inserted into corresponding multiple openings (7) in ladder tapes (2, 3) and are loosely fitted there. When one ladder tape (2) is pulled upwardly and the other ladder tape (3) is pulled downwardly, respective weft yarns (6) of the ladder tape (2) come into contact with lower surfaces of the corresponding light distributing members (1) to apply an upward lifting force Fl to the light distributing members (1) and respective weft yarns (6) of the other ladder tape (3) come into contact with upper surfaces of the corresponding light distributing members (1) to apply an downward pushing force F2 to the light distributing members (1). Accordingly, each of the light distributing member (1) is held between the weft yarn (6) positioned at a lower end of the each opening (7) of one ladder tape (2) and the weft yarn (6) positioned at an upper end of the each opening (7) of the other ladder tape (3).