PURPOSE: To provide a component hanging structure which can absorb thermal expansion difference, fix easily at site without necessity of welding and has good work availability.

CONSTITUTION: To concrete 11 at ceiling support part, an embedding metal 12 fixed with a plurality of hanging pieces 12c in combined lower plate 12a is embedded and fixed. In a hanging beam 13 hung by a component 16, a hanging piece l2c of the embedding metal 12 and a hanging piece 13d connected with a pin 14 are fixed. Then hanging piece 12c of the embedding metal 12 and a hanging piece 13d of the hanging beam 13 are connected with a pin 14 to absorb thermal expansion, and simultaneously welding at site is avoided to facilitate construction and improve the workability. Also when a component 16 is hung down the hanging beam 13, it is hung down via a constant hanger 15. Between the hung component 16 and a fixing part, a vibration prevention part 17 for stopping horizontal vibrations in vertical and horizontal directions are provided 17 to more surely support components.