Heat exchange device

A heat exchange device comprising:

• a first flow path configured such that a first fluid flows through the first flow path;
• a second flow path configured such that a second fluid flows through the second flow path, the second flow path being separated from the first flow path by a tubular partition wall and the second flow path being positioned close to an outer circumference of the tubular partition wall;
• an offset fin installed in a tubular shape extending along an inner circumferential surface of the tubular partition wall, the offset fin being provided with a plurality of wave-shaped portions arranged in an axial direction of the tubular partition wall and the wave-shaped portions being provided such that positions of wave-shapes of the wave-shaped portions adjacent to each other offset from each other in a circumferential direction of the tubular partition wall;
• and
• a pressing member disposed inward of the offset fin such that the offset fin is pressed toward the inner circumferential surface of the partition wall while being elastically deformed.