(Task) Provide an automatic expansion device, automatic expansion method, and expander exchange method that can improve the efficiency of expansion work. (Solving means) The automatic pipe expansion device includes a pipe expansion device 3 and a robot that supports and moves the pipe expansion device 3. Further, the expansion device 3 includes an expander 4, a rotation actuator 6 for rotationally driving the mandrel 41 of the expander 4, and a clamp device for clamping the frame member 42 of the expander 4 ( 7) and a moving device 8 for moving the clamp device 7 in the axial direction of the expander 4.
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