A friction stir welding equipment according to an embodiment includes a spindle unit, a holder, and a moving part; the spindle unit is capable of rotating a tool; the holder is connectable to the tool via a radial bearing and is capable of holding at least one of a side surface of a processing member or a rim of an upper surface of the processing member; and the moving part is capable of changing relative positions of the tool and the holder with respect to the processing member.