<p>An electro hydrostatic actuator (2) includes an actuator body, a hydraulic pump (5) driven to supply operation oil to the actuator body, and an electric motor (6) configured to drive the hydraulic pump. Each of the hydraulic pump and the electric motor is placed so as to surround the outer periphery of the actuator body, and the hydraulic pump and the electric motor are arranged in a direction along a center axis (X).
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