A radio frequency identification tag including a substrate, an antenna provided at the substrate, the antenna formed by winding a conductor in a coil pattern around, and on a plane orthogonal to, a center axis of the substrate, the center axis extending in a direction parallel to the thickness direction of the substrate, a radio frequency identification chip attached to the substrate and operative to perform radio communication with a reader/writer apparatus through the antenna, and a package sealing the substrate and the antenna as well as the radio frequency identification chip therein, wherein a mark for specifying the center axis is formed on an outside surface where the package is exposed to the outside.

 
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