PURPOSE: To provide equipment for recovering energy in an aircraft.

CONSTITUTION: A cabin exhaust duct 2 composed so that a cabin exhaust stream 5 flows into the cabbin exhaust duct 2 is connected to a pressure cabin 6 in an aircraft on one side, and to a peripheral zone 7 of the aircraft on the other side, a heat carrying body 11 is composed so that heat is supplied from a heat source 10a, and that it flows into a conductive duct 3, and a heat exchanger device 4 is provided between the cabin exhaust duct 2 and the conductive duct 3 so that it has a low temperature before the cabin exhaust stream 5 flows into the heat exchanger device, and that the heat carrying body 11 has a high temperature. An energy converting unit 8 is provided from the heat exchanger device 4 to a back range of an exit inside the cabin exhaust duct 2, and a consumption part 9 is connected to the energy converting unit 8.