Socket wrench

A socket wrench comprising

• an operating handle,
• a drive attached to said operating handle and having a supporting hole,
• a steel ball pressed by a spring and movably engaged in said supporting hole,
• a wrench body having an assembling hole for allowing said drive to engage therein, a recess part for allowing said steel ball to partly engage therein being formed in said assembling hole of said wrench body, a connecting hole engageable with a polygonal head part of a bolt to be operated being formed in said wrench body in such a manner as to be coaxial with said drive, said recess part having a pair of contacting walls for allowing said steel ball to contact therewith, said pair of contacting walls being disposed in mutually intersecting directions,
• one of said pair of contacting walls being formed with a curved surface of a large arc on a side of said recess part more distant from said operating handle, the other of said pair of contacting walls being formed with a curved surface of a small arc on a side of said recess part nearer said operating handle, and
• an opening end of said recess part being formed in one plane and having an elliptical shape in a direction intersecting with an axis of said wrench body.