Ballpoint pen tip, ballpoint pen refill, and ballpoint pen

A ballpoint pen tip comprising:

• a ball having a diameter of 0.5 mm or less;
• and a tip body that holds the ball, wherein
• the tip body has
• a ball holding chamber that holds the ball,
• a rear hole located rearward of the ball holding chamber,
• an ink flow hole that allows the ball holding chamber and the rear hole to communicate with each other, and
• an ink flow groove extending in a radial direction from the ink flow hole, opening to the ball holding chamber, and not reaching the rear hole,
• when an ink consumption per 100 m of handwriting is A (mg) and the diameter of the ball is B (mm), a ratio (A/B) of the ink consumption A to the diameter B of the ball is 200 mg/mm or more and 800 mg/mm or less,
• when a front end of the ink flow groove is set as a start point and a position of 0.3 mm rearward from the front end of the ink flow hole is set as an end point, a volume of a space in the ink flow hole and the ink flow groove from the start point to the end point is 0.02 mm3 or more, and
• the volume of the space in the ink flow hole and the ink flow groove from the start point to the end point is 1.5 times or more a volume of a space in the ball holding chamber from a tip end of the tip body to the start point.