An injector for a combustor of a gas turbine, the injector comprising: an injector body; and a slit formed to pass the injector body along a reference direction, wherein the slit includes: a first slit portion having a shape that extends along a circumferential direction of an imaginary reference circle, a center of which is an imaginary reference axis that extends along the reference direction; and a second slit portion having a shape that extends along a radial direction of the reference circle, wherein the first slit portion includes: a -th slit having a shape that extends along an imaginary first reference circle, a center of which is the reference axis; and a -th slit having a shape that extends along a circumferential direction of an imaginary second reference circle, a center of which is the reference axis and a diameter of which is larger than that of the first reference circle characterized in that when it is assumed that an area between the first reference circle and the second reference circle is a first area, the second slit portion includes: a -th slit disposed in the first area and extending in a radial direction of the first reference circle. an injector body; and a slit formed to pass the injector body along a reference direction, wherein the slit includes: a first slit portion having a shape that extends along a circumferential direction of an imaginary reference circle, a center of which is an imaginary reference axis that extends along the reference direction; and a second slit portion having a shape that extends along a radial direction of the reference circle, wherein the first slit portion includes: a -th slit having a shape that extends along an imaginary first reference circle, a center of which is the reference axis; and a -th slit having a shape that extends along a circumferential direction of an imaginary second reference circle, a center of which is the reference axis and a diameter of which is larger than that of the first reference circle characterized in that when it is assumed that an area between the first reference circle and the second reference circle is a first area, the second slit portion includes: a -th slit disposed in the first area and extending in a radial direction of the first reference circle. a first slit portion having a shape that extends along a circumferential direction of an imaginary reference circle, a center of which is an imaginary reference axis that extends along the reference direction; and a second slit portion having a shape that extends along a radial direction of the reference circle, wherein the first slit portion includes: a -th slit having a shape that extends along an imaginary first reference circle, a center of which is the reference axis; and a -th slit having a shape that extends along a circumferential direction of an imaginary second reference circle, a center of which is the reference axis and a diameter of which is larger than that of the first reference circle characterized in that when it is assumed that an area between the first reference circle and the second reference circle is a first area, the second slit portion includes: a -th slit disposed in the first area and extending in a radial direction of the first reference circle. a -th slit having a shape that extends along an imaginary first reference circle, a center of which is the reference axis; and a -th slit having a shape that extends along a circumferential direction of an imaginary second reference circle, a center of which is the reference axis and a diameter of which is larger than that of the first reference circle characterized in that when it is assumed that an area between the first reference circle and the second reference circle is a first area, the second slit portion includes: a -th slit disposed in the first area and extending in a radial direction of the first reference circle. a -th slit disposed in the first area and extending in a radial direction of the first reference circle.