A pneumatic brake booster including a booster housing having at least one housing shell. The housing shell is designed to be substantially pot-shaped with a center axis, a base portion and a lateral portion, and the base portion has a curved or conical wall region. In order to offer a brake booster by which it is possible to cost-effectively realize improved adaptability to customer- and application-specific requirements with respect to the spatial connection arrangement, at least one flattened surface area is formed in a radial outer region of the base portion, is designed to be elongate in the circumferential direction and has, at its radial outer edge, at least two notches which are arranged with respect to one another in a defined grid pattern with a circle angle.