PROBLEM TO BE SOLVED: To sink quickly, to have excellent usability, and to obtain floating feeling in the water, regardless of a material of a metal jig.SOLUTION: A metal jig 11 includes a slender metal jig body 1 having a wide center part, and having a width becoming narrower gradually toward the end. In the jig body 1, a plurality of recesses 1b are arranged in a row on a center part in a longer direction on one surface 1a side and in a width direction, and a specific-gravity adjustment material 2 for adjusting a specific gravity as the whole metal jig is inserted into the recesses 1b, and the recesses 1b are closed by a lid 3.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2020,JPO&INPIT【課題】メタルジグの材料にかかわらず、速く沈み、使い勝手がよく、水中での浮遊感を得る。【解決手段】メタルジグ１１は、中央部が幅広で、端部に向かって幅が徐々に狭くなる細長いジグ本体１を備える。ジグ本体１は、一面１ａ側の長手方向および幅方向の中央部に複数の凹部１ｂが列状に配置され、凹部１ｂ内に、メタルジグ全体としての比重を調整する比重調整材２が挿入され、凹部１ｂは蓋３にて閉じられている。【選択図】図５
