Abstract: The invention relates to an external mammary prosthesis (1) comprising a framework (2) made of flexible material having the shape of a breast, said framework (2) defining an internal cavity and having, at a proximal end, an annular base (3) conformed to the shape of the chest of a person and, at a distal end, a solid disc zone (4) having the shape of a nipple and its adjacent areola, the disc zone (4) defining a sagittal axis, the annular base (3) being connected to the disc zone (4) by sinuous arms (5) made of flexible material, said arms (5) demarcating the internal cavity and being spaced apart from each other in order to define aeration zones (6) extending into the internal cavity.