Tool Holder and Method for Assembling the Same

A tool holder, comprising:

• a tool holder main body having a rear hole, an intermediate hole, a collet holding hole, and a boundary wall surface, said rear hole extending forward from a rear end of said tool holder main body along an axis, said intermediate hole connecting to a front end of said rear hole, and extending forward along said axis, said collet holding hole being a tapered hole that connects to a front end of said intermediate hole, extends to a top end of said tool holder main body along said axis, and has an inner diameter increasing toward said top end, and said boundary wall surface being located along a boundary between said rear hole and said intermediate hole, and facing forward;
• a tapered collet detachably inserted in said collet holding hole, having a tool insertion hole formed in a top end region, and being formed so that an outer diameter of an outer peripheral surface of said top end region increases toward said top end;
• a drawing screw positioned in said intermediate hole, and having a head and a screw, a rear end face of said head facing said boundary wall surface, and a top end region of said shaft being screwed in a rear end of said collet;
• and
• a stopper member positioned in an annular space between an outer peripheral surface of said shaft of said drawing screw and an inner peripheral surface of said intermediate hole, and facing a front end face of said head of said drawing screw, for limiting movement of said head toward said top end.