Retractable Rod Structure of Hand Tool

A retractable rod structure of a hand tool, comprising:

• an inner rod disposed along an axis and having a coupling end;
• a tightening seat disposed in the coupling end of the inner rod, the tightening seat having a tightening surface on a circumferential side thereof around the axis, the tightening surface having a beginning point and a terminal point, a distance between the tightening surface and the axis increasing from the beginning point to the terminal point in a first direction around the axis;
• a tightening ring fitted on the tightening surface and rotatable relative to the tightening surface, the tightening ring having a C shape, the tightening ring having a thin end and a thick end, a thickness of the tightening ring increasing from the thin end to the thick end in a second direction opposite to the first direction around the axis;
• and
• an outer rod being hollow and fitted on the inner rod along the axis, an outer wall of the tightening ring being against an inner wall of the outer rod.