PURPOSE: A manufacturing method of an underwater float for fishing is provided, which lowers production cost by simplifying production process and achieves exact buoyancy. CONSTITUTION: A manufacturing method of an underwater float for fishing comprises a step for forming a disc part projected in the center and an insertion bar(31) facing both sides of the disc; a step for forming a tapered portion(30) in each end part of the insertion bar; a step of obtaining the length that has the same weight as display weight of the lead shell sinker for fishing using specific gravity of metal; a step for putting the disc part in the mold for forming after automatically cutting it; and a step for pressure-molding according to insertion bar diameter(35) of the fixed insertion bar, insertion bar length, disc part diameter, and disc part thickness.
