A method for manufacturing an interdental cleaner, the method comprising: a first step of molding a base portion by filling composite material including synthetic resin into a first mold having a first space in correspondence to the base portion including a handle portion, which has a shape that is at least partially curved, and a shaft portion connected to a distal end portion of the handle portion, the shaft portion having a sectional area smaller than a sectional area of the handle portion, and a shape which allows the shaft portion to be inserted into an interdental space; and a second step of forming a cleaning portion, which is configured to clean the interdental space, and a slip resistance portion by filling elastomer into a second mold under a condition in which the base portion is situated in the second mold, the second mold including a second space configured to form the cleaning portion around the shaft portion and form the slip resistance portion on a surface of the handle portion, wherein in the first step, what is molded as the handle portion includes a base, a recessed portion having a shape recessed from a surface of the base, and a bulge portion bulging from a portion of a surface of the recessed portion, which is distant from a boundary between the base and the recessed portion, and wherein in the second step, the cleaning portion is formed around the shaft portion, and the slip resistance portion is formed on the surface of the recessed portion by filling the elastomer into the second space from a portion of the base portion which is closer to the shaft portion than the bulge portion so that the elastomer flows along the shaft portion and the recessed portion. a first step of molding a base portion by filling composite material including synthetic resin into a first mold having a first space in correspondence to the base portion including a handle portion, which has a shape that is at least partially curved, and a shaft portion connected to a distal end portion of the handle portion, the shaft portion having a sectional area smaller than a sectional area of the handle portion, and a shape which allows the shaft portion to be inserted into an interdental space; and a second step of forming a cleaning portion, which is configured to clean the interdental space, and a slip resistance portion by filling elastomer into a second mold under a condition in which the base portion is situated in the second mold, the second mold including a second space configured to form the cleaning portion around the shaft portion and form the slip resistance portion on a surface of the handle portion, wherein in the first step, what is molded as the handle portion includes a base, a recessed portion having a shape recessed from a surface of the base, and a bulge portion bulging from a portion of a surface of the recessed portion, which is distant from a boundary between the base and the recessed portion, and wherein in the second step, the cleaning portion is formed around the shaft portion, and the slip resistance portion is formed on the surface of the recessed portion by filling the elastomer into the second space from a portion of the base portion which is closer to the shaft portion than the bulge portion so that the elastomer flows along the shaft portion and the recessed portion.