Position input apparatus

A position input apparatus comprising:

• a body portion including a position detection sensor and an operation surface;
• and
• an extension portion attachable to the body portion,
• wherein the body portion includes:
• a side surface with a thickness in a direction intersecting the operation surface, and
• a screw hole on the side surface of the body portion,
• wherein the extension portion includes:
• a screw having a shaft with a screw thread corresponding to the screw hole on the side surface of the body portion, and
• a head with a thickness in a center axis direction of the shaft,
• wherein the screw extends from inside of the extension portion such that the shaft protrudes outside of the extension portion from a side surface of the extension portion, and a side surface of the head of the screw is exposed to a side of the extension portion including an upper surface and is rotatable by a user,
• wherein the extension portion is attached to the body portion by the screw being screwed into the screw hole on the side surface of the body portion;
• wherein the extension portion is a pen holder that holds an electronic pen, and the extension portion includes a top plate including a recessed portion that holds the electronic pen,
• wherein a housing portion of a core body of the electronic pen is on a lower side of the top plate, and
• wherein the top plate is removable.