An indicator detecting device that can limit input by an indicator to a partial region within a panel surface is provided. The indicator detecting device includes a sensor having a detecting region for detecting a finger. The sensor outputs an output signal corresponding to a position indicated by the finger in the detecting region. The indicator detecting device includes a position calculating processor that calculates a value indicating the position based on the output signal. The indicator detecting device includes a controller that performs signal processing corresponding to the position based on the calculated value. When a plurality of calculated values indicate that the finger has designated a region within the detecting region, the controller performs different processing of the calculated value indicating a position corresponding to the inside of the designated region than that indicating a position corresponding to the outside of the designated region.