PURPOSE: To shorten the operating time required for changing a broaching tool, by making the turnover of a tool tunnel and tooling adjustments performable on a bed by a broach changer.

CONSTITUTION: In time of changing a broaching tool 20, a broach holder 15 being fitted with a new broaching tool 26 is locked to the upper side of a tool tunnel 11. Then, the tie-up of the tool tunnel 11 to a bed 14 is released, and when a piston rod (unillustrated herein) is pulled back to the lower part, the tunnel 11 goes up. And, the tool tunnel 11 gets coming down with its own weight. When the tunnel 11 comes down onto the bed 14, the tunnel 11 is locked to the bed with a bolt, thus changing the broaching tool 20 is over.