Interdental cleaning tool

An interdental cleaning tool comprising:

• a cleaning tool body that is made of a synthetic resin, and includes a grip portion that is capable of being gripped with fingers of a user and a shaft portion that extends in one direction from the grip portion;
• and
• a cleaning portion configured to clean between teeth, having bristles, covering a leading end of the shaft portion, and made of an elastomer,
• wherein
• the shaft portion includes a first region that extends from a leading end of the grip portion and a second region that extends from a leading end of the first region to an upper end of the cleaning portion,
• the cleaning portion is adjacent to the second region of shaft portion,
• the first region is formed in a substantially triangular shape in a plan view in a thickness direction of the grip portion so that a width of the first region decreases along a longitudinal direction extending from the grip to the second region in the plain view, and in the substantially triangular shape, a length of the first region in the longitudinal direction, as a height, is longer than the width, as a base, in a direction perpendicular to the longitudinal direction,
• the second region is formed in a shape of a rod in cross-section,
• a length in the second region from the leading end of the first region to the second end of the bristles of the cleaning portion is shorter than the height of the substantially triangular shape of the first region,
• (rotational angle b)/(rotational angle a) is 0.82 or more, and
• each of the rotational angles a and b is 28 degrees or more,
• where the rotational angle a is a rotational angle (degrees) when a torque value A is measured, the torque value A being a maximum torque value (N·cm) when the grip portion is rotated at a rotational speed of 10 rpm about a position located 6 mm away from a leading end of the cleaning portion, and
• the rotational angle b is a rotational angle (degrees) when a torque value B is measured, the torque value B being a maximum torque value (N·cm) when the grip portion is rotated at a rotational speed of 10 rpm about a position located 10 mm away from the leading end of the cleaning portion.