Cardboard box for receiving food, said box being convertible into a tray, said box including - a lid part which in a box position of the box constitutes a part of an upper part of the box, - a bottom part, which in the box position of the box constitutes a part of a lower part of the box, - a rear wall part which in the box position of the box constitutes a rear wall thereof, wherein the rear wall part is hinged to the bottom part and the lid part, wherein along a perimeter of the lid part and the bottom part sidewall parts (18, 18', 22, 22', 26, 30) are provided which are relative to the associated lid part and the bottom part respectively, and have, in the box position of the box, a perpendicular or substantially perpendicular position, wherein first sidewall parts (18, 18') associated with the lid part are connected to second sidewall parts (22, 22') associated with the bottom part via a flaplike hinge element respectively and wherein the respective hinge element is embodied and provided with folding lines (40, 44, 48, 50) such that: - in the tray position the hinge element is in an elongated position connecting the associated first and second sidewall parts (18, 22; 18', 22') at a distance, wherein the lid part, the rear wall part and the bottom part are located in the same plane or substantially in the same plane constituting a continuous tray surface and - in the box position the hinge element is folded towards the rear wall part along the folding lines (40, 44, 48, 50) wherein the lid part and the bottom part are parallel or substantially parallel to each other and perpendicular or substantially perpendicular relative to the rear wall part, wherein the respective first sidewall part (18, 18') is located alongside the associated second sidewall part (22, 22'); wherein the respective hinge element includes a center flap part to which, along a first flap folding line, a first outer flap part and, along a second flap folding line, a second outer flap part is hinged, wherein the first outer flap part is hinged via a third flap folding line to the associated first sidewall part, and wherein the second outer flap part is hinged to the second sidewall part via a fourth flap folding line, being the first outer flap part different in size with respect to the second outer flap part; characterized in that the third flap folding line constitutes an acute angle with a folding line between the rear wall part and the lid part, wherein the third flap folding line is inclined towards the center flap part, and / or the fourth flap folding line and a folding line between the rear wall part and the bottom part constitute an acute angle, wherein the fourth flap folding line is inclined towards the center flap part, being said center flap part slightly asymmetrical along a symmetry axis which is parallel to the folding lines (8, 12) between the bottom part and the rear wall part and between the lid part and the rear wall part respectively. - a lid part which in a box position of the box constitutes a part of an upper part of the box, - a bottom part, which in the box position of the box constitutes a part of a lower part of the box, - a rear wall part which in the box position of the box constitutes a rear wall thereof, - in the tray position the hinge element is in an elongated position connecting the associated first and second sidewall parts (18, 22; 18', 22') at a distance, wherein the lid part, the rear wall part and the bottom part are located in the same plane or substantially in the same plane constituting a continuous tray surface and - in the box position the hinge element is folded towards the rear wall part along the folding lines (40, 44, 48, 50) wherein the lid part and the bottom part are parallel or substantially parallel to each other and perpendicular or substantially perpendicular relative to the rear wall part, wherein the respective first sidewall part (18, 18') is located alongside the associated second sidewall part (22, 22');