PROBLEM TO BE SOLVED: To provide a fishing weight that is resistant to water including seawater, is durable, has good formability, is safe and convenient, can be added with a new function and is inexpensive, to solve a problem with a conventional fishing weight that it is made of lead and is harmful to life, then, a weight using safe metal with a heavy specific gravity represented by iron has to be created, however, formability is poor when hard metal is used and it is very rusty under the influence of seawater, and therefore a hook portion is replaced with other metal under the influence of rust, and also painting is difficult and easily peeled off, and further is weak against scratches.SOLUTION: A structure of the present invention for achieving above purpose is configured by developing a composite material weight of metal and concrete, etc. The coral with lead carried thereon is made to perish. However, the coral with iron carried thereon is likely to be increased in the portion. Accordingly, a production method is provided in which the iron is used for a core material and concrete or the like is used for wrapping therearound. A shape being resistant to a tide flow and the work of a hooking portion are not required, and also the iron core is wrapped inside. Painting is also easy and can prevent deterioration of the concrete. Thereby, a large cost cut and addition of a new feature becomes very easy. It becomes optimum for mass production, and thereby a supply amount can be increased greatly.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】 従来の釣用錘は鉛製で生物に害が有る。そこで鉄に代表される比重の重い安全な金属を使った錘を作成しなければならない。しかし硬い金属となると成形性が悪く、海水などの影響で非常に錆びやすい。フック部分など錆の影響で他の金属に置き換えている。塗装なども難しく剥がれやすい上にキズに弱い。海水など水に強く、耐久性があり、成形性がよく、安全で使い勝手の良い新しい機能も付加でき、安価な釣り用錘を提供する。【解決手段】 上述の目的を達成する本発明の構造は金属とコンクリート等の複合材錘の開発である。鉛が乗ったサンゴは死滅するが鉄が乗ったサンゴはその部分増殖すると言われる鉄材を芯材に使いその回りをコンクリートなどで包み込む製法である。潮流れに強い形状やフック掛け部分の細工が要らず、鉄芯なども中に包まれる。塗装もしやすくコンクリートの劣化を防ぐ事が可能である。それにより大幅なコストカットと新機能の付加がとても簡単になる。大量生産にも最適になり大幅に供給量を
