PROBLEM TO BE SOLVED: To improve the reading accuracy of an RFID (Radio Frequency-Identification) tag attached together with an ear mark to an ear capsule of an animal for carrying out radio individual identification from the outside.SOLUTION: A rectangular ear mark 10 includes a shaft part 2 having an arrowhead part 2E and protrusively provided at one end of a body 1 thereof, and a latching part 3 for the arrowhead part 2E provided at the other end of the body 1, and is formed of a synthetic resin. A hook-like member 11 or a bridge-like member for holding the RFID tag 6 having a width narrower than the width in the shorter direction of the body 1, made of the synthetic resin, and having a microchip 4 and an antenna 5 built therein is provided in a part of the body 1 to be positioned inside, and a pedestal part 13 is disposed and composed for providing a gap part between the RFID tag 6 and the rectangular body 1. The rectangular ear mark 10 is attached to an upper end part of the root part of the ear capsule of the animal striding over the end of the ear capsule.COPYRIGHT: (C)2012,JPO&INPIT【課題】動物の耳殻に耳標と共に取り付けられ、無線で個体識別を行うRFIDタグの外部からの読み取り精度を向上させる。【解決手段】短冊形耳標10を、その本体1の一端に矢尻部2Eを備えた軸部2を突設し、他端には矢尻部2Eの係止部3を設けて合成樹脂で構成し、本体1の折り曲げられて内側となる部分には、幅が本体1の短手方向の幅よりも狭くマイクロチップ4とアンテナ5とを内蔵する合成樹脂製のRFIDタグ6を保持するためのフック状部材11又はブリッジ状部材を設けると共に、RFIDタグ6と短冊状本体1との間に空隙部を持たせる台座部13を配して構成する。この短冊形耳標10は動物の耳殻の根元部分の上端部分に、耳殻端部を跨いで取り付けられる。【選択図】図1