A machining datum point detecting apparatus detects a first mark (70) formed on a V block (18) of a grinder on which a rotating tool (13) is held as a workpiece by using an image pickup device and a control device. Next, the machining datum point detecting apparatus detects a second mark (71) formed on a proximal end (13a) of the rotating tool (13) based on the first mark (70). Then, the machining datum point detecting apparatus detects a distal end position (K) of the rotating tool (13) based on the second mark (71) to use the distal end position as a datum point when machining the rotating tool (13).
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