Roller blind which comprises a winder roller (3) rotatably constrained at the ends (4, 5) thereof to a support structure (2) and susceptible of winding and unwinding a fabric (7). The roller blind also comprises a support device (16), which is fixed to the support structure (2) and supports a corresponding end (4) of the winder roller (3). Such support device (16) comprises two rotatable levers (19', 19") provided with corresponding retention portions (20) and configured for rotating between an open position, in which the retention portions (20) of the levers (19', 19") are rotated away from each other in order to allow the end (4) of the winder roller (3) to pass between the levers (19', 19"), and a closed position, in which the retention portions (20) of the levers (19', 19") are rotated closer to each other, between them delimiting a seat (21) in which the end (4) of the winder roller (3) is rotatably housed.