Inductor core, electronic pen core body portion, electronic pen, and input device

An inductor core comprising

• a magnetic main body having a tubular shape or a pillar shape and comprised of a magnetic material, wherein
• the magnetic main body includes:
• an inclined portion including an inclined surface that constitutes an outer circumferential surface of a truncated cone having an outer diameter increasing from one end of the magnetic main body toward the other end;
• and
• a straight body portion that is coaxial with the inclined portion and extends from the other end toward the one end, the straight body portion being connected to the inclined portion and including an outer peripheral surface that constitutes an outer circumferential surface of a circular tubular body or a cylindrical column body, and
• a skewness Rsk of an outer peripheral surface of the straight body portion located at or around the inclined portion is smaller than a skewness Rsk of an outer peripheral surface of the straight body portion located at or around the other end.