A breast shield for a breast pump for expressing human breast milk comprises a rigid base part (1) with a tubular connection piece (10) and with a funnel (11), which is integrally moulded in one piece thereon and widens away from the connection piece (10), for receiving a breast. The breast shield additionally comprises a flexible collar (2) which is arranged on the funnel (11) at an end of the funnel (11) remote from the connection piece (10) and which is realized to be placed onto the mother's breast. The named end of the funnel (11) forms a first contact surface (12) and an end of the collar (2) which faces the funnel (11) forms a second contact surface (22) and they both adjoin one another in an obtuse manner in a circumferential connecting joint (4), wherein the connecting joint is a butt joint. The funnel (11) comprises a first wall thickness (14) and the collar (2) comprises a second wall thickness (24), wherein said second wall thickness (24) is approximately the same size as the first wall thickness (14). The breast shield according to the invention can be produced in a simple and cost-efficient manner and nevertheless is very comfortable to wear and can be placed in position on the breast in a sealing manner.