To provide the thrust adjusting mechanism for the side thruster of a flying craft, which can produce thrust to an intended direction other than the direction normal to the axis of the flying craft in response to command acceleration, and is high in performance.

The mechanism is equipped with followings formed over and along the outer circumference of each identical cross section at equal intervals, they are firstly the same number of openings 5a in an elliptical shape each having an identical length, secondly each movable nozzle 3 which is radially projected at equal intervals toward the outer circumference of a gas generator 4, its center is extended outward in the radial direction through each spherical shaped, or each cylindrical shaped joint the center of which is pivotally supported by each pin in the axial direction, and its tip end can be moved to its longer direction along each aforesaid opening 5a in anelliptical shape, and thirdly each nozzle revolution means which is provided for the gas generator 4 respectively, and allows each movable nozzle 3 to be revolved selectively to the right or left by a desired angle.