A position indicator (1, 1A,1D) having a pen-shaped casing,,for indicating a position on a sensor surface of a sensor (212,401) that is to be detected by the sensor (212, 401) via an interaction with the sensor (212, 401), wherein the casing includes, in respective axial end portions thereof, a first indicating portion and a second indicating portion, and interaction circuits for causing interactions between the sensor (212, 401) and the first indicating portion and the second indicating portion; the first indicating portion includes a core body projecting axially from the casing of the position indicator (1, 1A,1D) and a first circuit element of the interaction circuits for allowing a position indicated on the sensor surface by the first indicating portion to be detected via an interaction between the interaction circuits and the sensor (212,401); the second indicating portion includes an erasing member (131, 131A, 131D) projecting axially from the casing and a second circuit element of the interaction circuits for allowing a position indicated on the sensor surface by the second indicating portion to be detected via an interaction between the interaction circuits and the sensor (212, 401); the erasing member (131, 131A, 131D) included in the second indicating portion and projecting from the casing is held by a holder (132, 132A); the holder (132, 132A) includes a member contributing to the interaction with the sensor (212,401) to make the holder (132, 132A) cooperate with an interaction between the second circuit element and the sensor (212, 401); the core body is configured to visibly form handwriting on a sheet of paper in response to a writing operation of the position indicator; the erasing member (131, 131A, 131D) is configured to visually erase. from the sheet of paper, handwriting that is visibly formed by the core body included in the first indicating portion; the interaction between the second indicating portion and the sensor (212, 401) is caused by an electromagnetic coupling based on the interaction circuits that include a resonant circuit 13R) made up of a capacitive element and an inductive element wound on a magnetic material (135, 135A); the second circuit element included in the second indicating portion includes the magnetic material (135, 135A) of the resonant circuit 13R); the holder (132, 2. 132A) that holds the erasing member (131, 131A, 131D) is made of a magnetic material and cooperates with the magnetic material of the resonant circuit 13R) in causing the interaction with the sensor (212, 401); the erasing member (131, 131A, 131D) is made of rubber for visually erasing handwriting; and the holder (132, 132A) is a rubber eraser case (132, 132A) for housing a portion of the erasing member (131, 131A, 131D). the casing includes, in respective axial end portions thereof, a first indicating portion and a second indicating portion, and interaction circuits for causing interactions between the sensor (212, 401) and the first indicating portion and the second indicating portion; the first indicating portion includes a core body projecting axially from the casing of the position indicator (1, 1A,1D) and a first circuit element of the interaction circuits for allowing a position indicated on the sensor surface by the first indicating portion to be detected via an interaction between the interaction circuits and the sensor (212,401); the second indicating portion includes an erasing member (131, 131A, 131D) projecting axially from the casing and a second circuit element of the interaction circuits for allowing a position indicated on the sensor surface by the second indicating portion to be detected via an interaction between the interaction circuits and the sensor (212, 401); the erasing member (131, 131A, 131D) included in the second indicating portion and projecting from the casing is held by a holder (132, 132A); the holder (132, 132A) includes a member contributing to the interaction with the sensor (212,401) to make the holder (132, 132A) cooperate with an interaction between the second circuit element and the sensor (212, 401); the core body is configured to visibly form handwriting on a sheet of paper in response to a writing operation of the position indicator; the erasing member (131, 131A, 131D) is configured to visually erase. from the sheet of paper, handwriting that is visibly formed by the core body included in the first indicating portion; the interaction between the second indicating portion and the sensor (212, 401) is caused by an electromagnetic coupling based on the interaction circuits that include a resonant circuit 13R) made up of a capacitive element and an inductive element wound on a magnetic material (135, 135A); the second circuit element included in the second indicating portion includes the magnetic material (135, 135A) of the resonant circuit 13R); the holder (132, 2. 132A) that holds the erasing member (131, 131A, 131D) is made of a magnetic material and cooperates with the magnetic material of the resonant circuit 13R) in causing the interaction with the sensor (212, 401); the erasing member (131, 131A, 131D) is made of rubber for visually erasing handwriting; and the holder (132, 132A) is a rubber eraser case (132, 132A) for housing a portion of the erasing member (131, 131A, 131D).