Electronic pen including waterproof structure and electronic device including the same

An electronic pen comprising:

• a pen housing;
• a substrate assembly mounted in the pen housing and configured to generate a resonant frequency by electromagnetic induction;
• a pen head installed on one end of the housing;
• a key button installed in a button receiving hole formed on an appropriate location of an outer surface of the pen housing;
• and
• a packing member disposed on at least a part of the substrate assembly,
• wherein the substrate assembly comprises:
• a substrate comprising a switch configured to operate by an operation of the key button;
• a pen pressure sensor connected to one side of the substrate;
• a coil holder comprising a coil connected to the pen pressure sensor;
• a pen tip disposed in a manner that the pen tip is configured to penetrate through the coil holder, and includes at least a part thereof exposed to the outside of the pen housing;
• and
• a head bracket connected to the other side of the substrate to be connected with the pen head, and
• wherein, when the substrate assembly is assembled with the pen housing, at least a part of the packing member is configured to overlap an inner surface of the pen housing.