To provide an electronic earmark using recovered reusable tag having information recording medium enclosed with resin and a recovery and reuse method thereof so as to enable to reuse plural times the information recording unit, to much decrease the cost per once use of the information recording unit, and to promptly propagate radiocommunication technology containing IC tag.

There is provided an electronic earmark using recovered reusable tag having information recording medium enclosed with resin which includes a resinous earmark including an enclosure tag attaching body provided by forming a brim on one end side of a stem and an arrowhead-like stopper part on the other end side and a receiving part with a hole for holding the stopper, and an information recording unit resin enclosure tag perfectly enclosing the information recording unit in the resin and independent of the earmark, wherein, the information recording unit enclosure tag is composed to loosely fit to the stem part of the enclosure tag attaching body in order to recover and reuse the information recording unite resin enclosure tag itself.

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