An oven comprising a) a cooking chamber wherein foods to be cooked are disposed, b) a body that has a ceiling, a base, a rear wall, a frame-shaped front wall and two side walls, all of which surround the cooking chamber, and that is formed by joining the base, ceiling, rear wall, front and side walls (4 and 5); c) an opening which is located on the front wall and which allows access to the cooking chamber, d) a door which is opened by rotating around a horizontal rotation axis and which provides the opening to be closed, e) two housings which are located on both sides of the front wall, f) two hinges that have a hinge body passing through the housing and a hinge arm, one end of which is fixed to the hinge body and the other end to the door, and that provide the door to be opened and closed as a result of the movement of the hinge body and the hinge arm with respect to each other about the horizontal rotation axis of the door, g) a right-triangular mounting member - which has at least two edges (H and V) vertical to each other, and being parallel to the side wall, - which is fixed to the base through the slope formed by the mounting member horizontal edge and the base side edge being vertically bent inwards, - which is fixed to the front wall through the slope formed by the mounting member vertical edge and the front wall side edge being vertically bent inwards, - whereon the hinge body is fixed. a) a cooking chamber wherein foods to be cooked are disposed, b) a body that has a ceiling, a base, a rear wall, a frame-shaped front wall and two side walls, all of which surround the cooking chamber, and that is formed by joining the base, ceiling, rear wall, front and side walls (4 and 5); c) an opening which is located on the front wall and which allows access to the cooking chamber, d) a door which is opened by rotating around a horizontal rotation axis and which provides the opening to be closed, e) two housings which are located on both sides of the front wall, f) two hinges that have a hinge body passing through the housing and a hinge arm, one end of which is fixed to the hinge body and the other end to the door, and that provide the door to be opened and closed as a result of the movement of the hinge body and the hinge arm with respect to each other about the horizontal rotation axis of the door, g) a right-triangular mounting member - which has at least two edges (H and V) vertical to each other, and being parallel to the side wall, - which is fixed to the base through the slope formed by the mounting member horizontal edge and the base side edge being vertically bent inwards, - which is fixed to the front wall through the slope formed by the mounting member vertical edge and the front wall side edge being vertically bent inwards, - whereon the hinge body is fixed. - which has at least two edges (H and V) vertical to each other, and being parallel to the side wall, - which is fixed to the base through the slope formed by the mounting member horizontal edge and the base side edge being vertically bent inwards, - which is fixed to the front wall through the slope formed by the mounting member vertical edge and the front wall side edge being vertically bent inwards, - whereon the hinge body is fixed.