To reliably cool and seal with simple constitution in a stack type gas turbine.

The gas turbine 100 connects a compressor turbine with a distant piece 7. The distant piece and a turbine first stage disk 1 are connected to a joint part 11. The distant piece has a projected part 7c. A spacer 8 is held by spigot parts 7d, 8d and fixed by a bolt 10 and a nut 10a. The spacer forming a thin part 8b in an outer diameter thereof is in contact with a fin 13 of the turbine disk through a seal member 14. The turbine disk, the distant piece and the spacer form a partitioned chamber 8a.