To improve an external appearance grade by making a filament body embedded inside unable to see through from outside in an interdental brush formed so as to easily remove an eating residue between teeth.
In this manufacturing method, a brush wire stem 2 composed of a twisted wire to which a brush 1 is fixed is integrally connected by an inmold to a handle 3 molded by a molding metal mold. In this case, at least opposed one of plural projecting bodies oppositely arranged at intervals in a handle molding space of the molding metal mold 4 so as to project in the central direction, is brought into contact with the peripheral side of the brush wire stem 2, and a base end part 21 of the brush wire stem 2 is held in an almost central part of the handle molding space, and the handle 3 is formed by injection molding, and is formed as an interdental brush 10.
NAGOYA HIDEMI
YOSHIKAWA SUSUMU
MAANA KK
LION CORP