To ensure pressure resistance of a header pipe by forming a pair of right and left header pipes and liquid tanks in tubular shapes, supporting the tanks to one tank by upper and lower supports, and interposing an interval between the one pipe and the one tank.

A condenser 1, a liquid tank 2 and a sub-condenser 3 are disposed in series from an upstream side to a downstream side. The condenser 1 is constituted by parts of a pair of header pipes 4a, 4b at an upper side part from respective partition walls 5, and the sub-condenser 3 is constituted by the residue of the pipes 4a, 4b at a lower side part from the respective walls 5. The tank 2 has a cylindrical case 19, a cover 18 covering an upper end opening of the case 19, and a connecting block 20 fixed to the lower end opening of the case 19, and is clamped at mounting block 13, 31 as upper and lower supports fixed to the lower outer surface and upper end of the pipe 4b by bolts 25, 32.