PROBLEM TO BE SOLVED: To provide an interdental care tool capable of efficiently supplying a mouth cavity composition stored in a mouth cavity composition discharge body to plural care parts forming a care body, while securing intensity of the care body sufficiently.SOLUTION: A care body 12 comprises a guide part 27 disposed on a position capable of receiving a mouth cavity composition discharged from a penetration part 19 for discharge, and guiding the mouth cavity composition so that the mouth cavity composition directs to a care part 26.