Abstract: A combination knife including a common blade member that carries two different blade elements having cutting edges, each blade element located on a respective side of a pivot joint carried in a knife handle and around which the common blade member can be rotated. One blade element includes a conventional knife-acting cutting edge, while the other blade element includes a stomach-opening cutting edge situated on the upper edge of the blade element when in its use position. A stop is provided for preventing rotation of the common blade member relative to the handle after rotation of the common blade member in a direction such that one of the two cutting edges has been brought to its use position. The cutting edge of the knife-acting blade element and that of the stomach-opening blade element are situated along the same edge of the common blade member.