A touch panel includes a insulator, X electrodes arranged on one insulator surface and each including X lines, Y electrodes arranged on another insulator and each including Y lines, X auxiliary lines each connecting adjacent X lines, and Y auxiliary lines each connecting adjacent Y lines. The auxiliary lines are located on diagonals of cells L, defined by the X lines and the Y lines and arranged in rows and columns. The X and Y auxiliary lines are arranged without overlapping or being superposed on each other. Each of the rows and columns includes at least one cell having either the X or Y auxiliary lines and at least one cell having neither the X or Y auxiliary lines. The rows include no row that has neither the X or Y auxiliary lines, and the columns include no column that has neither the X nor the Y auxiliary lines.