The invention relates to a breast shield unit for use together with a breast pump for extracting human breast milk by means of a vacuum comprising a dimensionally stable breast shield (2) and a flexible breast shield insert (3) to be inserted into the breast shield (2). The breast shield (2) has a first open breast shield end to be placed on a mother's breast. The breast shield insert (3) has a first and a second insert end (34, 36), which define a longitudinal direction (a), wherein the first open breast shield end has a circumferential rim (22), to which the breast shield insert (3) can be or is fixed by the first insert end (34). When fitted, the breast shield insert (3) extends in the interior of the breast shield (2) from said first insert end (34) to the second insert end (32), wherein the breast shield insert (3) runs between the first and the second insert end (34, 32), substantially at a distance from the breast shield (1, 2). When the breast shield insert (3) has been fitted, the second insert end (32) can be displaced in the longitudinal direction (a) relative to the breast shield (2). The breast shield unit according to the invention matches the shape of the mother's breast in an optimal manner and optimizes the contact force.
