To facilitate the packaging, transportation and carrying-in of a blind by an interlocking mechanism of the blind which interlockably connects drive shafts provided in a plurality of blind support members, and to make workability excellent.

Adjacent side ends of head rails 16 and 18 adjacent to each other are provided with joint parts 56 and 58 which are actionally connected to rotating shafts 34 and 44. The joint parts 56 and 58 are engaged with each other by making the joint part 58 of one head rail 18 move relatively to the other head rail 16 in a fixed state while can be separated from each other. Thus, the rotating shafts 34 and 44 in the head rails 16 and 18 are interlocked with each other to make rotation transmittable.