Abstract: The invention relates to a breast prosthesis for breast-amputated women with a flexible plastic body comprising two plastic sheets connected to each other along their common edge and a plastic mass enclosed between the two plastic sheets, wherein the plastic body has a front side formed to resemble the contour of the natural breast and a back side capable of facing the torso of the person, and an elastically deformeable thin part secured with its edge to the back side of the plastic body. In order to improve the wear comfort of the breast prosthesis, the thin part is secured to the plastic body inside the common edge of the connected plastic sheets.