Multifunction pen

A multifunction pen comprising:

• a shaft tube including openings at both of a tip end and a rear end;
• a plurality of writing refills that are housed inside the shaft tube, each of the plurality of writing refills including a writing tip exposed through the opening at the tip end;
• a plurality of knock rods that are respectively accessible through window holes in the shaft tube extending along an axial direction of the shaft tube, the plurality of knock rods respectively actuating the plurality of writing refills;
• and
• an electromagnetic induction refill that is housed inside the shaft tube, that is disposed in parallel to the plurality of knock rods, that overlaps the plurality of knock rods in a direction orthogonal to the axial direction of the shaft tube, that is exposed through the opening at the rear end, and that is employed in electromagnetic induction-based input.