Fuel injector and gas turbine

A fuel injector comprising:

• a fuel supply tube which has a tubular shape centered on an axis and into which a fuel gas is introduced from an upstream side in an axial direction in which the axis extends, a plurality of premix tubes which have a tubular shape extending in the axial direction and into which air is introduced from the upstream side;
• a support plate which supports a downstream side in the axial direction of the fuel supply tube and upstream end portions of the plurality of premix tubes, and oriented perpendicularly to said axis;
• a substrate which supports downstream end portions of the plurality of premix tubes, and oriented perpendicularly to said axis;
• an outer wall which is cylindrical, which connects the support plate to the substrate and forms a plenum inside together with the support plate and the substrate, a partition plate which partitions the plenum into a fuel plenum and a cooling air plenum disposed downstream of the fuel plenum, and oriented perpendicularly to said axis;
• a baffle, disposed downstream of the partition plate and upstream of the substrate, with at least a partially inclined portion radially outward on the downstream side with respect to said axis, and having holes through which premix tubes pass therein, and cooling holes are not formed in the al least partially inclined therein, and cooling holes are not formed in the at least partially inclined portion and a cooling air supply tube which is configured to supply cooling aft to the upstream cooling air plenum, wherein an end portion on the downstream side of the fuel supply tube opens in the fuel plenum;
• and at least one fuel introduction hole which penetrates each of the premix tubes inward and outward is formed at a portion positioned in the fuel plenum of the premix tube, wherein the baffle includes:
• a baffle body in which the cooling holes are formed and which is provided radially inside and attached to said outer wall with the axis as a center.