To provide an integrated heat exchanger capable of preventing adverse effects caused by a thermal expansion amount difference between a tube and a tube plate while forming a plurality of heat exchange parts in one heat exchanger core.

The integrated heat exchanger provided with the plurality of independent heat exchange parts 11 and 12 is formed by alternately arranging pluralities of tubes 4 and fins 5 to form the heat exchanger core 1, and attaching independent tanks T1-T4 to both ends of the tubes of the heat exchanger core 1 via the tube plates 2a-2d, respectively. A tube plate is separated at a position which serves as a boundary of the adjacent heat exchange parts 11 and 12 to form the tube plates 2a and 2c (2b and 2d), and a tube corresponding to the position is used as a dead tube 15.