A position indicator (1, 1A, 1B) having a pen shape, and electrostatically interacting with a sensor, the position indicator (1, 1A, 1B) comprising: a casing of a pen shape; a conductive core body disposed such that a pen tip of the core body protrudes from an opening on one end side in an axial direction of the casing; a conductor surrounding the conductive core body; a signal transmitting circuit configured to generate a signal for electrostatically interacting with the sensor, and supply the generated signal to the core body; and a control circuit configured to produce different electrostatic interactions with the sensor by performing first control that sets the conductor surrounding the core body in a first state of being grounded in terms of alternating current in a state in which the signal is sent out from the pen tip of the core body to the sensor, so that the conductor covering the core body electrostatically shields the core body, and acts to suppress sending of a signal from the part covering the core body, and performing second control that sets the conductor surrounding the core body in a second state different from the first state of being grounded in terms of alternating current, so that the electrostatic shielding of the conductor is released, wherein the position indicator (1, 1A, 1B) is configured such that, in a state in which the core body is inclined at an inclination angle (θ) with respect to the sensor surface, positions of peak values (P 1, P2) of the signals received by the sensor in the first and second states do not coincide with each other, so that the inclination angle can be detected from a distance between the positions of the peak values (P1, P2), wherein the position indicator is characterized in that the second control is a control that sets the conductor surrounding the core body in an electrically isolated state. a casing of a pen shape; a conductive core body disposed such that a pen tip of the core body protrudes from an opening on one end side in an axial direction of the casing; a conductor surrounding the conductive core body; a signal transmitting circuit configured to generate a signal for electrostatically interacting with the sensor, and supply the generated signal to the core body; and a control circuit configured to produce different electrostatic interactions with the sensor by performing first control that sets the conductor surrounding the core body in a first state of being grounded in terms of alternating current in a state in which the signal is sent out from the pen tip of the core body to the sensor, so that the conductor covering the core body electrostatically shields the core body, and acts to suppress sending of a signal from the part covering the core body, and performing second control that sets the conductor surrounding the core body in a second state different from the first state of being grounded in terms of alternating current, so that the electrostatic shielding of the conductor is released, wherein the position indicator (1, 1A, 1B) is configured such that, in a state in which the core body is inclined at an inclination angle (θ) with respect to the sensor surface, positions of peak values (P 1, P2) of the signals received by the sensor in the first and second states do not coincide with each other, so that the inclination angle can be detected from a distance between the positions of the peak values (P1, P2), wherein the position indicator is characterized in that the second control is a control that sets the conductor surrounding the core body in an electrically isolated state.