To improve heat exchange efficiency and ensure minimization.

A heat storage structure 2 where a plurality of vent passages 2a filed with a heat storage material 2C are formed peripherally in parallel are provided freely to be driven and rotated. There are disposed a first supply hole portion 6 for supplying heated gas G to the heat storage structure 2 and a first reception hole portion 8 for receiving the heated gas G passing through the heat storage structure 2 at a specific portion peripherally. There are provided a second supply hole portion 10 for supplying gas g to be heated to the heat storage structure 2 and a second reception hole portion 12 for receiving the gas g passing through the heat storage structure 2 at anopther specific position. There are further provided first pressure adjustment means for making pressure in a first case 13 for sealing from the outside the installation positions of the first supply hole portion 6 and the first reception hole portion 8 larger than those in the first supply hole portion 6 and the first reception hole portion 8, and second pressure adjustment means for making pressure in a second case 14 for sealing from the outside the installation positions of the second supply hole portion 10 and the second reception hole portion 12 larger than those in the second supply hole portion 10 and the second reception hole portion 12.