The blind (1) has a support unit (2) fixing the blind at a wall of building. A load bar (7) has a profile realized in a manner to close an enclosing case (3) when a web is in a rolled up position. Centering units (8) center the profile of the load bar. The centering units have a centering part (9) connected to the load bar, and cooperating with another centering part (10), located inside the case. The centering units are realized in a manner such that the former part is positioned between a roller (4) of the blind web and the latter part during closing from the case.
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