To provide an interdental cleaning tool which can improve the cleaning property on a side surface of a tooth and between teeth with suppressing a decrease in insertability of a cleaning portion between teeth. An interdental cleaning tool (2) includes a base portion (10) having a shaft portion (20) and a grip portion (30), and a cleaning portion (40). The cleaning portion (40) has a cleaning portion main body (42) and brush portions (44). Each of the brush portions (44) has a brush main body having a shape protruding outward from the cleaning portion main body in an axially intersecting direction, and a protrusion that has a shape protruding outward in a reference plane, which is a plane encompassing a center axis of the shaft portion (20) and a center axis of the brush main body, from an outer edge of the brush main body when the brush main body is cut along the reference plane, and is continuously connected along the outer edge of the brush main body.
