To reduce manufacturing costs, to avoid leakage of fluid, and to enable manufacture of even a structure with a large bore.

In a high-temperature rotating valve in which an elastic seat 6 is interposed in the gap between each end opening 1a, 1b in a valve box 1 and a valve element 2, the elastic seat 6 is divided into an outer-periphery seat part 6A and an inner-periphery seat part 6B, which are connected and integrated together by welding 6C, with the outer-periphery seat part 6A fastened to the valve box 1 by a fastener 10 via a gasket 9 and with the inner- periphery seat part 6B made to abut to the valve element 2.