To provide method for manufacturing interdental cleaner configured to suppress leakage of elastomer from space for forming slip resistance portion in mold to outside of space in step of filling elastomer into mold. Method for manufacturing interdental cleaner includes first step of molding base portion having handle portion and shaft portion (40) by filling composite material into first mold, and second step of forming cleaning portion and slip resistance portion by filling elastomer into second mold (200) with the base portion situated in second mold (200). In first step, what is molded has handle portion including base (24), recessed portion (26), and bulge portion (28) bulging from surface of the recessed portion (26). In second step, cleaning portion and slip resistance portion are formed by filling elastomer into second space from portion of base portion distant from bulge portion (28) toward shaft portion (40).
