The module integrated type refrigerant condenser includes a roughly cylindrical right side header connected to the outlets of a plurality of condensing tubes and the inlets of a plurality of supercooling tubes, and a modulator directly connected to the right side header in the width direction of the core. By providing a partition part for dividing the second inner space into two gas-liquid separation chambers, the modulator is formed into a shape as if two roughly cylindrical pipe bodies were stacked up in the thickness direction of the core, and the width thereof is made shorter in comparison with a simple, cylindrical modulator.