Combustor and gas turbine

A combustor comprising:

• a fuel nozzle extending along an axis;
• a tubular combustor basket configured to cover the fuel nozzle;
• and
• a tubular transition piece configured to form a cooling air passage through which air from the outside is introduced formed between the transition piece and an outer circumferential surface of a leading end portion of the combustor basket and extending toward the leading end side of the combustor basket,
• wherein a position in a radial direction of the leading end of the combustor basket partially varies in a circumferential direction,
• the combustor basket includes an inner diameter side leading end portion in which the position in the radial direction of the leading end is located relatively inward in the radial direction and an outer diameter side leading end portion in which the position in the radial direction of the leading end is located relatively outward in the radial direction, and
• an inclined surface extending inward from an outer side in the radial direction from one side toward the other side in an axial direction is formed between the inner diameter side leading end portion and an inner circumferential surface of the combustor basket.