PROBLEM TO BE SOLVED: To provide a molded body for water quality treatment, in the molded body contaminated water and microalga being always in contact with each other so that effective water cleaning ability can be stably exhibited, and when the time comes to finally dispose of the molded body its volume reduction is easy, by using a molded body with which microalga that takes contaminants such as heavy metals and radioactive materials in water into its body can be quite easily molded in a desirable shape and size and strongly immobilized.SOLUTION: A method of manufacturing a molded body containing the microalga as described above is provided, in the method dried powder type microalga being added to and dispersed in a material to mold a molded body in an arbitrary ratio and then molded into an arbitrary shape.COPYRIGHT: (C)2015,JPO&INPIT【課題】水中の重金属、放射性物質等の汚染物質を体内に取り込む微細藻類を、任意の形状、大きさに極めて容易に成形し、強固に固定化できる成形体を用いることにより、常に汚染水と微細藻類が接触して、安定して効率的な水質浄化能力が発揮でき、最終的に処分する場合も減容化が可能な水質処理用成形体を提供する。【解決手段】上記の微細藻類を含有した成形体の製造方法であって、乾燥した粉末状の微細藻類を任意の割合で成形体形成用材料に添加して分散させた後、任意の形状に成形した成形体の製造方法を特徴とする。【選択図】図1