Roller awning which comprises: - a support structure intended to be fixed to a load-bearing structure; - a roller rotatably constrained to said support structure and intended to be positioned above an opening obtained on said load-bearing structure; - at least one cloth windable around said roller, provided with an upper edge fixed to said roller, with a lower edge, and with two lateral edges, each provided with a flexible engagement flap; - a transverse bar fixed to the lower edge of said cloth and provided with lateral terminations; - two uprights arranged parallel to each other, intended to be fixed along the lateral flanks of said opening, and each carrying, slidably constrained, the corresponding lateral termination of said transverse bar; - two rails, each of which mechanically associated with the corresponding upright and provided with a longitudinal groove adapted to slidably receive the engagement flap of the corresponding lateral edge of said cloth; each said upright comprising: - a support profile having a substantially L-shaped cross section and provided with a first wall and a second wall substantially orthogonal to each other; - a guide profile mechanically fixed to said support profile; - fixing means acting on said support profile, in order to retain it fixed to said load-bearing structure; said roller awning being characterized in that each said guide profile is made in a single body and comprises: - a first arm and a second arm, each provided with a corresponding constrained end (21', 22') directed towards the first wall of said support profile and with an opposite corresponding free end (21", 22"); - a bottom wall placed to connect the constrained ends (21', 22') of said arms (21, 22); the free ends (21", 22") of said arms (21, 22) being spaced from each other and delimiting a longitudinal opening, inside of which the corresponding lateral termination of said transverse bar is slidably inserted; said arms (21, 22) and said bottom wall together delimiting an internal seat in which the corresponding rail is housed in a retention relationship, such rail being positioned with said longitudinal groove directed towards said longitudinal opening; said support profile comprising at least one first clasping element provided with an engagement seat having an insertion opening directed towards the corresponding lateral termination of said transverse bar; said guide profile comprising at least one second clasping element engaged in a retention relationship with said at least one first clasping element by means of insertion of said at least one second clasping element in said engagement seat according to at least one coupling direction orthogonal to the first wall of said support profile; said support profile comprising at least one first coupling element and said guide profile comprising at least one flexible second coupling element, which is snapplingly engaged with said at least one first coupling element, locking said guide profile at least according to said coupling direction. - a support structure intended to be fixed to a load-bearing structure; - a roller rotatably constrained to said support structure and intended to be positioned above an opening obtained on said load-bearing structure; - at least one cloth windable around said roller, provided with an upper edge fixed to said roller, with a lower edge, and with two lateral edges, each provided with a flexible engagement flap; - a transverse bar fixed to the lower edge of said cloth and provided with lateral terminations; - two uprights arranged parallel to each other, intended to be fixed along the lateral flanks of said opening, and each carrying, slidably constrained, the corresponding lateral termination of said transverse bar; - two rails, each of which mechanically associated with the corresponding upright and provided with a longitudinal groove adapted to slidably receive the engagement flap of the corresponding lateral edge of said cloth; - a support profile having a substantially L-shaped cross section and provided with a first wall and a second wall substantially orthogonal to each other; - a guide profile mechanically fixed to said support profile; - fixing means acting on said support profile, in order to retain it fixed to said load-bearing structure; - a first arm and a second arm, each provided with a corresponding constrained end (21', 22') directed towards the first wall of said support profile and with an opposite corresponding free end (21", 22"); - a bottom wall placed to connect the constrained ends (21', 22') of said arms (21, 22);