To provide a sushi rice which is excellent in adhesion to ingredients and sushi rice which does not collapse by placing sushi rice thereon and putting sushi table etc. after putting ingredients in a mold, Provide a bone grubber that can be easily made even at home and the like.SOLUTION: A body part having a recess 2 having a bottom surface 3 of a ship bottom shape is formed on a top surface of a member having a rectangular cross section, and a belt-like member 5 covering the bottom surface 3, The sushi tool material and the sushi rice placed on the main body are placed upside down and then the end of the belt member 5 is pressed to lift the main body portion to form a bridge.(FIG.【課題】型に具材を入れた後に、その上にすし飯を入れて、すし台等を被せてひっくり返すことにより、具材との密着性がよく、かつすし飯が形崩れしないにぎりずしを、家庭等でも簡単に作ることができる、にぎりずし器を提供する。【解決手段】矩形の断面を有する部材の天面に、船底形の底面3を有する窪み2が形成された本体部と、底面3を掩塞する帯状部材5と、を備え、帯状部材5上に順次すし用具材及びすし飯が載置された本体部の天地を逆さまにした後、帯状部材5の端を押さえて本体部を持ち上げることによりにぎりずしを形成する。【選択図】図2