An electromechanical brake actuator (2) includes a housing (1), a first housing part (3) configured as a housing flange for attaching the electromechanical brake actuator (2) to a disc brake (38), a second housing part (4) for receiving a drive (6), a third housing part (5) arranged between the first housing part (3) and the second housing part (4) and connected to the first housing part (3) and the second housing part (4), a motor (37), a gearbox (7), and a tappet (9) or a spindle for actuating a disc brake (38). The housing (1) is an aluminum die-cast formed part. The first housing part (3) and the second housing part (4) have planar contact surfaces (34, 34a) configured to receive plates of a two-plate die-casting machine during the forming process of the housing (1).