An interdental cleaning instrument is equipped with a base part (10) and a cleaning part (20). The base part (10) has a shaft part (12) and a grip part (14). The cleaning part (20) has a shape that covers a portion including an insertion end section (12a) of the shaft part (12). At least the shape of the base part (10) is set in a manner such that a first pressing force required to press a portion spaced 2.5 mm apart from a tip of the cleaning part in 10 mm is 0.3 N or more and 1.4 N or less in a state in which a portion spaced 10 mm apart from the tip of the cleaning part is fixed, and a second pressing force required to press a portion spaced 8.0 mm apart from the tip of the cleaning part in 10 mm is 0.5 N or more and 2.5 N or less in a state in which a portion spaced 35 mm apart from the tip of the cleaning part is fixed.
