A heart valve prosthesis comprising a ring-shaped support structure (3) secured in an annulus and a leaflet (5) supported by the support structure. The support structure is sealingly engaged by the support wall portion (31) to which the root tip (51) of the leaflet is connected and the free end (52) of the leaflet (5) and at the joining surface (33). Complementary wall portion opposite the support wall portion that supports a joining surface (33) adapted to extend in a direction substantially parallel to the direction of movement of the free end (52) of the leaflet (5) (32). The free end of the leaflet (5) is a support wall portion using a traction member (55) dimensioned such that the free end (52) of the leaflet (5) is stopped at the joining surface (33). Or it is connected to a complementary wall part.弁輪において固着されるリング状の支持構造(3)と、支持構造によって支持される弁尖(5)とを備える心臓弁補綴物。支持構造は、弁尖の根端(51)が接続される支持壁部分(31)と、弁尖(5)の自由端(52)によって封止係合されるとともに、接合表面(33)における弁尖(5)の自由端(52)の移動方向に対して実質的に平行な方向で延びるように適合された接合表面(33)を支持する、支持壁部分とは反対側の相補壁部分(32)とを備える。弁尖(5)の自由端は、弁尖(5)の自由端(52)が接合表面(33)で停止されるようにして寸法決めされた牽引部材(55)を用いて、支持壁部分または相補壁部分に接続される。