Panel support, comprising - a supporting base defining a housing seat for the edge area of the panel, said seat having a bottom, two opposite sides that extend from said bottom and an opening for inserting the panel into the seat, provided at the ends of said sides, at least one of said sides comprising, in proximity of its end, a respective undercut portion, - at least one device for adjusting the tilt and for clamping the panel to said supporting base, interposed between the panel and said supporting base, comprising a concave cradle for housing the end of the edge of the panel, said cradle having an underside and two opposite lateral containment sides of said end of the edge of the panel, there being associated with at least one said containment side at least one respective assembly for adjusting the tilt and lateral clamping of the panel, wherein said assembly for adjusting the tilt and lateral clamping of the panel comprises - a wedge shaped element sliding on the outside of the respective side surface for containment of the cradle according to a direction from the bottom of said seat toward its opening and vice versa, said wedge shaped element having a first face that abuts on the outside of the respective side surface of the cradle and an opposite second face, tilted with respect to the direction of movement of the wedge shaped element, - an adjustment screw, arranged in an engaged way through a hole, counter-threaded to the screw, obtained through said wedge shaped element, said screw having an end adapted to bottom out against a portion of said cradle and an opposite end provided with a control head for a tool, so that a turn of said screw in a first direction causes said wedge shaped element to move toward said opening of the housing seat of the panel, while a turn in the opposite direction causes said wedge shaped element to move in the opposite direction toward the bottom of the seat, characterised in that the second face of the wedge shaped element is tilted from the inside toward the outside of the seat, with reference from the opening to the bottom of the seat, that the assembly for adjusting the tilt and lateral clamping of the panel further comprises at least one intermediate clamping element adapted to be arranged between said second face of the wedge shaped element and said undercut portion provided on a respective side of said housing seat, and that the turn of said screw in the first direction causing said wedge shaped element to move toward said opening of the housing seat of the panel thrusts said intermediate clamping element against the respective undercut portion of a respective side of said seat. - a supporting base defining a housing seat for the edge area of the panel, said seat having a bottom, two opposite sides that extend from said bottom and an opening for inserting the panel into the seat, provided at the ends of said sides, at least one of said sides comprising, in proximity of its end, a respective undercut portion, - at least one device for adjusting the tilt and for clamping the panel to said supporting base, interposed between the panel and said supporting base, comprising a concave cradle for housing the end of the edge of the panel, said cradle having an underside and two opposite lateral containment sides of said end of the edge of the panel, there being associated with at least one said containment side at least one respective assembly for adjusting the tilt and lateral clamping of the panel, - a wedge shaped element sliding on the outside of the respective side surface for containment of the cradle according to a direction from the bottom of said seat toward its opening and vice versa, said wedge shaped element having a first face that abuts on the outside of the respective side surface of the cradle and an opposite second face, tilted with respect to the direction of movement of the wedge shaped element, - an adjustment screw, arranged in an engaged way through a hole, counter-threaded to the screw, obtained through said wedge shaped element, said screw having an end adapted to bottom out against a portion of said cradle and an opposite end provided with a control head for a tool, so that a turn of said screw in a first direction causes said wedge shaped element to move toward said opening of the housing seat of the panel, while a turn in the opposite direction causes said wedge shaped element to move in the opposite direction toward the bottom of the seat,