An artificial joint includes a first joint assembly and a second joint assembly. The first joint assembly is adapted to be connected to a first bone and has a first contacting surface, wherein the first contacting surface includes a first convex arc surface, a second convex arc surface and a third convex arc surface. The second joint assembly is adapted to be connected to a second bone and has a second contacting surface, wherein the second contacting surface is in contact with the first contacting surface and includes a first concave arc surface, a second concave arc surface and a third concave arc surface, and the first concave arc surface, the second concave arc surface and the third concave arc surface are corresponding to the first convex arc surface, the second convex arc surface and the third convex arc surface.一種人工關節，包括一第一關節組件及一第二關節組件。第一關節組件適於連接於一第一骨骼且具有一第一接觸面，其中第一接觸面包括一第一凸弧面、一第二凸弧面及一第三凸弧面。第二關節組件適於連接於一第二骨骼且具有一第二接觸面，其中第二接觸面與第一接觸面相接觸且包括一第一凹弧面、一第二凹弧面及一第三凹弧面，第一凹弧面、第二凹弧面及第三凹弧面分別對應於第一凸弧面、第二凸弧面及第三凸弧面。
