A cooking device which heats a food in a heating chamber with a heating medium, including: a cabinet including the heating chamber; a door disposed on the cabinet so as to open and close an opening of the heating chamber; an open/close adjustment device which connects the cabinet and the door with each other and adjusts an operation force needed to open or to close the door, wherein the door is disposed so as to rotate about a horizontal door pivot shaft disposed in a lower part of the cabinet, the open/close adjustment device includes: a link one end of which is connected to the door at a position higher than the open/close fulcrum of the door and the other end of which is a free end; a base disposed at a fixed position; a pulley mounted on the base so as to be rotatable around a horizontal axis, the pulley supporting the link from beneath; and a spring which is disposed between the link and the base and exerts on the link a force that presses the link against the pulley and a force that causes the link to pull the door back to the totally closed position, a first protrusion and a second protrusion are formed on a lower surface of the link, the first protrusion is disposed between the door and the second protrusion, characterized in that the first protrusion is disposed such that, when the door is at the totally closed position, the summit of the first protrusion makes contact with the pulley, the operation force indicates a maximum value when the door is passing a predetermined angle, the maximum value is given by the first and second protrusions (128, 129), the first and second protrusions (128, 129) each produce a load when they go over the pulley, and, as the door is opened, the second protrusion, which is a following one, produces a load larger than a load produced by the first protrusion, which is a preceding one. a cabinet including the heating chamber; a door disposed on the cabinet so as to open and close an opening of the heating chamber; an open/close adjustment device which connects the cabinet and the door with each other and adjusts an operation force needed to open or to close the door, wherein the door is disposed so as to rotate about a horizontal door pivot shaft disposed in a lower part of the cabinet, the open/close adjustment device includes: a link one end of which is connected to the door at a position higher than the open/close fulcrum of the door and the other end of which is a free end; a base disposed at a fixed position; a pulley mounted on the base so as to be rotatable around a horizontal axis, the pulley supporting the link from beneath; and a spring which is disposed between the link and the base and exerts on the link a force that presses the link against the pulley and a force that causes the link to pull the door back to the totally closed position, a link one end of which is connected to the door at a position higher than the open/close fulcrum of the door and the other end of which is a free end; a base disposed at a fixed position; a pulley mounted on the base so as to be rotatable around a horizontal axis, the pulley supporting the link from beneath; and a spring which is disposed between the link and the base and exerts on the link a force that presses the link against the pulley and a force that causes the link to pull the door back to the totally closed position, a first protrusion and a second protrusion are formed on a lower surface of the link, the first protrusion is disposed between the door and the second protrusion, characterized in that the first protrusion is disposed such that, when the door is at the totally closed position, the summit of the first protrusion makes contact with the pulley, the operation force indicates a maximum value when the door is passing a predetermined angle, the maximum value is given by the first and second protrusions (128, 129), the first and second protrusions (128, 129) each produce a load when they go over the pulley, and, as the door is opened, the second protrusion, which is a following one, produces a load larger than a load produced by the first protrusion, which is a preceding one.