Capacitive electronic pen including detachable axial core body

A capacitive electronic pen, comprising:

• a housing that is cylindrical in shape;
• a core body that has a distal end and a trailing end, the distal end protruding from one opening in an axial direction of the housing, the trailing end being at an opposite end from the distal end in the axial direction, and the core body being detachably fitted to a core body holder disposed in a hollow space of the housing;
• and
• a peripheral electrode that is positioned near the one opening of the housing and formed of a conductor disposed to surround at least a portion of the core body excluding the distal end,
• wherein the core body includes an electrode core formed of a conductor having a spherical section and a shaft center section, the shaft center section having:
• a first section having a first diameter and physically directly connected to the spherical section, and
• a second section having a second diameter greater than the first diameter and physically directly connected to the first section,
• wherein, when the core body is fitted to the core body holder, the first diameter of at least a portion of the first section that is not surrounded by the peripheral electrode is smaller than a diameter of the spherical section.