A food tray produced from a blank or die-cut made of paper material or cardboard for food comprising: - a main panel with which a side panel is foldably associated, wherein - said main panel consists of a rectangular frame, which is continuous, closed and without interruptions, and which comprises two shorter sides (2,3) and two longer sides (1,6), wherein said two shorter sides (2,3) extend in a longitudinal direction and said two longer sides (1,6) extend in a transverse direction, - two panels having reduced dimensions (5,4), shaped in the form of isosceles trapezoids extend from said two shorter sides (2,3) in a transverse direction towards a central internal opening or cutout of said main panel, - said side panel extends from one of said two long sides (1,6) of the main frame panel by means of a strip, which acts as an attachment portion of the side panel, - wherein said side panel comprises a central internal panel from which two transverse peripheral panels (8,13) and two longitudinal peripheral panels (10,18) extend outwardly on the four sides, one of said transverse peripheral panels being associated with said strip, which acts as an attachment portion of the side panel, and the other of said transverse peripheral panels, opposite the previous panel, being associated with a panel having a rectangular flap, - lines of glue being further provided (55,56,58,59,60,61) which join overlapping panels or parts thereof, characterized in that said two transverse peripheral panels (8,13) and said two longitudinal peripheral panels (10,18) are shaped in the form of an isosceles trapezoid, wherein said transversal peripheral panel in an intermediate area thereof provides a folding invitation line which thus defines a panel part thereof close to the central internal panel. - a main panel with which a side panel is foldably associated, wherein - said main panel consists of a rectangular frame, which is continuous, closed and without interruptions, and which comprises two shorter sides (2,3) and two longer sides (1,6), wherein said two shorter sides (2,3) extend in a longitudinal direction and said two longer sides (1,6) extend in a transverse direction, - two panels having reduced dimensions (5,4), shaped in the form of isosceles trapezoids extend from said two shorter sides (2,3) in a transverse direction towards a central internal opening or cutout of said main panel, - said side panel extends from one of said two long sides (1,6) of the main frame panel by means of a strip, which acts as an attachment portion of the side panel, - wherein said side panel comprises a central internal panel from which two transverse peripheral panels (8,13) and two longitudinal peripheral panels (10,18) extend outwardly on the four sides, one of said transverse peripheral panels being associated with said strip, which acts as an attachment portion of the side panel, and the other of said transverse peripheral panels, opposite the previous panel, being associated with a panel having a rectangular flap, - lines of glue being further provided (55,56,58,59,60,61) which join overlapping panels or parts thereof, characterized in that said two transverse peripheral panels (8,13) and said two longitudinal peripheral panels (10,18) are shaped in the form of an isosceles trapezoid, wherein said transversal peripheral panel in an intermediate area thereof provides a folding invitation line which thus defines a panel part thereof close to the central internal panel.