Provided is an artificial knee joint with which the amount and rate of roll-back is lower with shallow bending and greater with deep bending. This artificial knee joint has: a femoral component (20) comprising a medial condyle (21), a lateral condyle (22), a first sliding surface (24) posteriorly coupling the medial condyle (21) and lateral condyle (22) and leaving an opening (23) therebetween, and a second sliding surface (25) above the first sliding surface (24) and a tibia plate (30) comprising a medial fossa (31), a lateral fossa (32), a post (36) protruding upward from between the medial fossa (31) and lateral fossa (32) and inserted into the opening (23), a third sliding surface (34) with which the first sliding surface (24) makes contact on the posterior surface of the post (36), and a fourth sliding surface (35) with which the second sliding surface (25) makes contact at a location posterior to the post part (36). The first and fourth sliding surfaces (24, 35) are convex curved surfaces, and the fourth sliding surface (35) is posterior to the third sliding surface (34) depending on the angle of bending, the joint is in either a first sliding state, where the first and third sliding surfaces (24, 34) make contact, or a second sliding state, where the second and fourth sliding surfaces (25, 35) make contact.Linvention porte sur une articulation de genou artificielle au moyen de laquelle la quantité de recul « rollback » et le taux de recul sont inférieurs avec une flexion superficielle et supérieurs avec une flexion en profondeur. Cette articulation de genou artificielle a : une pièce fémorale (20) comprenant un condyle médian (21), un condyle latéral (22), une première surface coulissante (24) couplant de manière postérieure le condyle médian (21) et le condyle latéral 22 et laissant une partie douverture (23), et une deuxième surface coulissante (25) au-dessus de la première surface coulissante (24) et une plaque de tibia (30) comprenant une fosse médiane (
