A fuel injector that is supplied with compressed air from an upstream side, the fuel injector comprising: a pilot fuel injection portion including a pilot fuel supply block and a tubular pilot shroud , the pilot shroud being arranged at a radially outer side of the pilot fuel supply block and projecting to a downstream side beyond the pilot fuel supply block ; a main fuel injection portion including a main air passage in which a pre-mixed gas is generated, the main fuel injection portion being arranged so as to surround the pilot fuel injection portion from an outer side in a radial direction; and an intermediate air passage arranged between the pilot fuel injection portion and the main fuel injection portion , wherein: the pilot shroud includes a throat located at the downstream side of the pilot fuel supply block and a flame holding portion surrounding flame located at the downstream side of the throat , the flame holding portion having a shape that increases in diameter toward the downstream side; wherein an air injection slit that is open toward the downstream side and the radially outer side is formed at the flame holding portion , characterized in that the air injection slit is configured to inject the compressed air of the intermediate air passage in a direction along an inner peripheral surface of the flame holding portion such that the compressed air covers the inner peripheral surface over an entire periphery. a pilot fuel injection portion including a pilot fuel supply block and a tubular pilot shroud , the pilot shroud being arranged at a radially outer side of the pilot fuel supply block and projecting to a downstream side beyond the pilot fuel supply block ; a main fuel injection portion including a main air passage in which a pre-mixed gas is generated, the main fuel injection portion being arranged so as to surround the pilot fuel injection portion from an outer side in a radial direction; and an intermediate air passage arranged between the pilot fuel injection portion and the main fuel injection portion , wherein: the pilot shroud includes a throat located at the downstream side of the pilot fuel supply block and a flame holding portion surrounding flame located at the downstream side of the throat , the flame holding portion having a shape that increases in diameter toward the downstream side; wherein an air injection slit that is open toward the downstream side and the radially outer side is formed at the flame holding portion , characterized in that the air injection slit is configured to inject the compressed air of the intermediate air passage in a direction along an inner peripheral surface of the flame holding portion such that the compressed air covers the inner peripheral surface over an entire periphery. a throat located at the downstream side of the pilot fuel supply block and a flame holding portion surrounding flame located at the downstream side of the throat , the flame holding portion having a shape that increases in diameter toward the downstream side; wherein an air injection slit that is open toward the downstream side and the radially outer side is formed at the flame holding portion , characterized in that the air injection slit is configured to inject the compressed air of the intermediate air passage in a direction along an inner peripheral surface of the flame holding portion such that the compressed air covers the inner peripheral surface over an entire periphery. <EOS>