PROBLEM TO BE SOLVED: To provide a BTA deep hole processing machine capable of sufficiently achieving a sealing effect of a seal part, even when fastening force applied by a fastening tool is small.;SOLUTION: The BTA deep hole processing machine comprises: a cylindrical tool in the inside of which a flow channel extending to a region on one side from an end on the other side is formed; a tool rotating mechanism which supports at least a part of the one side of the tool and causes the tool to rotate around its axial line; a headstock which supports the tool rotating mechanism; a headstock moving mechanism which causes the headstock to move in an axial line direction of the tool; a cutting fluid supply device which, during processing of a workpiece, supplies cutting fluid between a surface to be cut of the workpiece and the tool, and causes the cutting fluid to reflux from the end of the other side of the tool to the region of the one side via the flow channel; a seal part abutting on the other side of the workpiece; a mobile body which supports the seal part; a mobile body moving mechanism which causes the mobile body to move in the axial line direction of the tool; and a fixing tool which fixes the mobile body so that movement of the mobile body by the mobile body moving mechanism is inhibited.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT
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