PROBLEM TO BE SOLVED: To reduce the force required to move the male ear target so as to allow the male ear target to move without countering the escape behavior of the animal, and to cope with soft ears, and even in the case of animals with hard ears, the male ear Simultaneously solve both conflicting problems of the technology that the tip of the mark does not slip. A male ear target mounting portion having a male ear target mounting portion to which a male ear target is mounted and a female ear target mounting portion having a female ear target mounting portion to which the female ear target is mounted are provided. The ear tag mounting portion 21 and the female ear tag mounting portion 10 approach each other against the force urged in the direction in which the ear tag mounting portion 21 and the female ear tag mounting portion 10 approach to each other by attaching the animal ear target ET to the ear E of the animal to which the ear target is mounted. In the mounting device T, the male ear target set portion 31 is movable in the escape direction of the animal to which the ear target is attached, and the male ear target 1 is passed through the ear E of the animal to which the ear target is mounted to transmit the female ear target 2. The male ear target set portion 31 is locked so that the male ear target set portion 31 cannot move in the escape direction of the animal to which the ear target is mounted when a force for fitting the male ear target is applied. [Selection diagram] Figure 2【課題】 動物の逃避行動に逆らわずに雄耳標が移動できるようにするために雄耳標移動に要する力を小さくして柔らかい耳へ対応する技術と、耳の表面が硬い動物でも雄耳標の先端が滑らない技術の相反する両方の問題を同時に解決する。【解決手段】 雄耳標１を取り付ける雄耳標セット部３１を有する雄耳標取付部２１と、雌耳標２を取り付ける雌耳標セット部１１を有する雌耳標取付部１０を備え、雄耳標取付部２１と雌耳標取付部１０とが離れる方向に付勢された力に抗して近づくことにより動物用耳標ＥＴを被耳標装着動物の耳Ｅに装着する動物用耳標装着器Ｔであって、雄耳標セット部３１を被耳標装着動物の逃避方向に移動可能にするとともに、雄耳標１を被耳標装着動物の耳Ｅを貫通させて雌耳標２に嵌め込むための力が作用した時に雄耳標セット部３１が被耳標装着動物の逃避方向に移動不可となるようにロックする構成にした。【選択図】図２
