An electronic pen has an electronic pen circuit and a core body disposed in a tubular external casing, and a circuit board that is disposed in the external casing and on which at least part of the electronic pen circuit is disposed. The electronic pen circuit and the circuit board are housed in a portion of a tubular internal casing housed in the external casing, and the core body is housed in the internal casing and the portion of the internal casing is filled with a resin in a state in which a tip part of the core body protrudes outside of the internal casing from a first opening of the internal casing on one side in an axial center direction of the internal casing.