A touch panel device includes processing circuitry to generate coordinate information based on a signal outputted from the touch panel and to output a detection value based on depressing force. The processing circuitry previously stores a plurality of pieces of predictive detection value information, selects a piece of predictive detection value information based on a gradient of the detection value, obtains a final predictive detection value that the predictive detection value finally reaches by using the selected predictive detection value information, obtains a present predictive detection value by using the selected predictive detection value information, and executes a correction process of reducing influence of a memory effect by bringing a present detection value close to the final predictive detection value when an absolute value of a difference between the present predictive detection value and the present detection value is less than or equal to a predetermined threshold value.