The present invention relates to an artificial hip joint capable of ensuring fitting length without an increase in the overall height of a caput sphere, avoiding concentration of stress, and alleviating stress generated in the caput sphere. The artificial hip joint comprises: a stem (6) having a neck part (5), which has a truncated cone-shaped external peripheral surface (4) in which the diameter is reduced in progress toward a distal end (3) a caput sphere (8) in which a recess (7) is formed for allowing the neck part (5) to be inserted, and in which the inner surface defining the recess (7) includes a truncated cone-shaped internal peripheral surface (10) in which the diameter is reduced in progress toward the insertion direction of the neck part(5) and a sleeve (2A) disposed between an external peripheral surface (4) of the neck part (5) inserted into the recess (7) and the internal peripheral surface (10) of the caput sphere (8). The sleeve (2A) has an internal peripheral part (13) for making contact with the external peripheral surface (4) of neck part (5), and an external peripheral surface (16) for making contact with the internal peripheral surface (10) of the caput sphere (8) using the retracted position in the insertion direction (A) from an opening part (14) of the recess (7) as the starting end.La présente invention concerne une articulation de hanche artificielle capable dassurer une longueur dajustement sans augmenter la hauteur totale dune sphère de tête, déviter la concentration de contrainte, et de soulager la contrainte générée dans la sphère de tête. Larticulation de hanche artificielle comprend : une tige (6) ayant une partie de col (5), qui présente une surface périphérique externe de forme tronconique (4), dans laquelle le diamètre diminue dans la direction dune extrémité distale (3) une sphère de tête (8) dans laquelle un évidement (7) est formé pour permettre que la partie de col (5) soit insérée, et dans laquelle la surface interne définiss
