The invention relates to medicine, in particular, traumatology and orthopedics and can be used in treatment of joints ulnar bone.Prosthesis distal ulnar bone head, has leg and head.Novelty of the claimed prosthesis consists in the fact, that leg is made in form of a truncated cone with apex angle of 2 degrees, length L, equal to 25.0 mm and diameter d on end, equal to 5.4 - 6.6 mm, on pedicle is made 6 longitudinal projections, head is made in form of truncated from both sides sphere with radius R, equal to 7.5 - 10.0 mm, width of head/is equal to 10.0 - 13.5 mm, on head is made spherical recess of depth of 0.5 - 1.0 mm, the back side of the head is made net structural surface, prosthesis monolithic and is made from zirconium dioxide.