A positional information correction device includes a positional information acquisition unit configured to acquire positional information showing a position of an operation body, which is detected by a position detection unit, from a touch sensor that includes a plurality of first electrodes wired along a first direction, a plurality of second electrodes wired along a second direction, and the position detection unit that detects the position of the operation body that approaches the first and second electrodes, based on capacitance on the first and second electrodes, a capacitance value acquisition unit configured to acquire a capacitance value showing a value of the capacitance on the first and second electrodes from the touch sensor, and a positional information correction unit configured to correct the positional information by using a first correction function that includes a first periodic function and a second correction function that includes a second periodic function.