To provide a guiding means of cooling air for simultaneously increasing cooling effect of the gas collection pipe for conveying hot gas in the gas collection pipe.

The gas collection pipe 1 for conveying hot gas forms a connection part connecting a combustion chamber 9 of a gas turbine plant to a flow passage 13 of a gas turbine. The gas collection pipe 1 includes two inlet pipe connection part 2, and the inlet pipe connection parts open in an axial direction to an annular gas passage 4 connected to the gas turbine flow passage 13 via a bent part 3 bent in an elbow shape. Cooling air is guided along the bent part 3 at an outside. A plurality of ribs 8 are provided on an opposite side of a side facing the gas turbine flow passage 13 of the gas collecting pipe 1 with intervals along the bent part 3.