The photovoltaic module (1) which can be installed on a vertical and/or inclined wall (2), comprises a photovoltaic panel (3), a peripheral support frame (4) of the photovoltaic panel (3), and at least one fixing profile (5) of the frame (4) to the wall (2), the support frame (4) having at least one profiled cross-beam (6) joint to at least one profiled upright (7), the upright (7) comprising a box-shaped body (8), a front angular wing (9) frontally extending towards the box-shaped body (8), a rear angular wing (11) extending on the rear towards the box-shaped body (8), the front angular wing (9) having a front portion (13) facing the front wall (10) of the box-shaped body (8), and a spacing portion (14) of the front portion (13) from the front wall (10) of the box-shaped body (8), such that the front wall (10) of the box-shaped body (8) delimits with the front angular wing (9) an engagement seat (15) for one side of the photovoltaic panel (3), the rear angular wing (11) having a rear portion (16) offset from the rear wall (12) of the box-shaped body (8) and a guide portion (17) along the fixing profile (5), first engagement means being further provided of the guide portion (17) with the fixing profile (5), and second engagement means of the rear portion (16) of the rear angular wing (11) with the fixing profile (5).