Abstract: Support device (1) for a panel (2), comprising: a profile (4) defining a housing section (5) into which a border (3) of said panel (2) is inserted, said housing section (5) being delimited by a base (6), by a first lateral wall (7) and by a second lateral wall (8) of the profile (4), said profile being constituted by a first portion (4a) and by a second portion (4b) different from each other; adjusting means (10) installed at the height of the panel (2) in relation to the base (6) of the profile (4), said adjusting means (10) being located inside the housing section (5) and being at least partially arranged nearby said first lateral wall (7) so that, with the border (3) of the panel (2) inserted in the housing section (5), these adjusting means (10) can be accessed through a first passing slot (11) located between the border (3) of the panel (2) and the first lateral wall (7); joining means (21) of the two portions (4a, 4b) of the profile (4), said joining means (21) including a bent plate (24) with a first e