The invention relates to a heat exchanger, especially a charge-air/coolant cooler (1), consisting of a plurality of disks (2), two adjacent disks (2) defining an intermediate region through which a heat exchanging medium flows. Said heat exchanger also comprises a heat exchanging medium inlet (9) and a heat exchanging medium outlet (11), that are common to the disks (2). At least two heat exchanging medium channels (5, 6) are respectively provided for the heat exchanging medium inlet and the heat exchanging medium outlet (9 and 11).