A heat exchanger, for example a charge-air cooler, may include at least two bases respectively having a passage for receiving a plurality of fluid-conducting tubes on a longitudinal end side. The heat exchanger may include at least one collecting chamber arranged on at least one of the at least two bases, and at least one lateral part received via a longitudinal end area at least partially in an end-side passage of an associated base of the at least two bases. The longitudinal end area of the at least one lateral part may have a beam shape and at least one recess. The longitudinal end area of the at least one lateral part may further have a cross-sectional surface that is smaller than a cross-sectional surface of the end-side passage of the associated base.