To provide a heat insulating constitution for a pipe house boarded with a corrugated plate for applying to a multi-purpose pipe house used for cultivation with co-generation system, agricultural tri-generation system and artificial illumination by LED (light emitting diode) and the like, storage/preservation under low temperature or a temporary house in natural disasters.

The heat insulating constitution is composed in the following way. (1) A steel sheet 2 or the like is provided for reinforcing a lightweight section steel arranged at the foot of a main pipe and an end post of the pipe house receiving the central load while a square pipe 3 with the main pipe and the end post having a corrugated plate 5 is provided. (2) The pipe house with the corrugated plate has an air inlet 8 and an air outlet covered with net 4, its main pipe and end post are provided with victoria lawn or the like and furthermore a foamed resin 9 by means of spray-foaming or a foamed resin plate with a shackle is provided. (3) A ventilation passage is provided between the corrugated plate 5 and the foamed resin 9/foamed resin plate. (4) A machine having a corrugated shape roller 12 and corrugated curved surface board 13 or the like is used for bending a corrugated steel plate.