A rotating tool for double-sided friction stir welding that joins two metal plates while rotating a pair of rotating tools facing each other in opposite directions, and a double-sided surface using the rotating tool for double-sided friction stir welding It is an object to provide a friction stir welding apparatus and a double-sided friction stir welding method. A rotary tool for double-sided friction stir welding, which is used for double-sided friction stir welding to join metal plates by rotating a pair of rotary tools arranged on the one surface side and the other surface side of unbonded parts of metal plates in opposite directions. There is a pair of double-sided friction stir welding rotary tools, each of which has a circular and flat tip portion, and the tip portions are made of a material harder than a metal plate.
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