Electronic pen and electronic pen main body

An electronic pen, comprising:

• a pen housing having an opening on a pen tip side and having a hollow portion inside;
• an electronic pen main body having a main body housing to be housed in the hollow portion of the pen housing, with an axial member installed on a first end side in an axial direction of the main body housing, and a second end side in the axial direction of the main body housing being locked in the pen housing;
• and
• a knock cam mechanism provided on the second end side in the axial direction of the pen housing, the knock cam mechanism being configured to hold the second end side in the axial direction of the main body housing and configured to push and retract the axial member installed on the main body housing of the electronic pen main body out of and into the pen housing from the opening defined on the pen tip side of the pen housing, based on a knock operation performed by a user,
• wherein
• a projection portion projecting in a direction crossing the axial direction of the main body housing is formed on an outer circumference portion of the main body housing of the electronic pen main body, at a predetermined position in the axial direction,
• a stopper portion to be engaged with the projection portion of the main body housing in a state in which a tip end side of the axial member is exposed outside from the opening of the pen housing, to prevent the electronic pen main body from moving toward the pen tip side in the pen housing, is formed on an inner wall surface of the hollow portion of the pen housing,
• the electronic pen main body includes an elastic displacement portion that elastically contracts to change a length in the axial direction of the electronic pen main body according to a load applied in the axial direction of the main body housing, and
• when the knock operation is performed, the elastic displacement portion elastically changes the length in a state in which the projection portion of the main body housing of the electronic pen main body and the stopper portion on the inner wall surface of the pen housing are engaged with each other.