A hip prosthesis has an oblong plate with at one head end a mounting pin provided with a hinge ball, and at the opposite head end a fastening pin for fastening the hip prosthesis in a shaft of a bone. A first part of the plate extends on a first side of the mounting pin. The mounting pin forms an angle α smaller than 90 degrees with the first part of the plate and the tangent to the fastening pin at the location of the connection between the fastening pin and the first part of the plate forms an angle β greater than 90 degrees with the first part of the plate. In order to insert the hip prosthesis into a bone in a simple manner, the fastening pin includes a curved shape from the plate onwards in a direction to the first part of the plate.