To provide an aircraft actuator that can achieve a significant weight reduction, while securing sufficient tensile strength and sufficient buckling strength, even if it is provided with a reaction link in which large bent portions are formed.

The reaction link 12 is made of fiber reinforced plastic, and includes a pair of linear portions 21, a coupling portion 22, and a pair of bent portions 23. The cross section at the pair of linear portions 21, the coupling portion 22, and the pair of bent portions 23 is formed as a hollow cross section. The outer cross sectional area of the hollow cross section at each of the pair of bent portions 23 is configured to be larger than the outer cross sectional area of the hollow cross section at each of the pair of linear portions 21.