[problem] Buchan to put Komase of fishing will become unstable when Komase is reduced. Even if wind is blowing, even scoop Komase in the ladle, always provide a weight to stabilize the Buchan. A foldable, the container 1 water can were placed sealed and weigh, removably attaching the Buchan outer bottom. Container and attached to the ear-shaped wheel 3 is the top four corners that were integrated, belt 4 with a freely passes through the ear-shaped wheel, respectively, to the tip of the belt, comes with key-shaped hook 5 that is applied to the handle or the like of Buchan are, they by and brought into close contact with the Buchan. .BACKGROUND 1【課題】魚釣りのコマセを入れるバッカンは、コマセが少なくなると不安定になる。風が吹いても、コマセを柄杓で掬っても、常にバッカンを安定させる重石を提供する。【解決手段】折り畳み可能な、水を入れ密閉できる容器1を重石とし、脱着可能にバッカン外側底部に取り付ける。容器と一体化した耳状の輪3が上部四隅に付き、自在付のベルト4がそれぞれ耳状の輪を通り、ベルトの先端には、バッカンの取っ手等に掛けられるかぎ状のフック5が付属し、これらによりバッカンに密着させる。【選択図】図1