A protection panel for detecting an X-Y coordinate as an operation position from a potential gradient based on a touch operation to a front substrate is provided. A rear substrate (5) has a first transparent resistive film (5A) and a contact point (5G) connected to a pair of first terminals (5D) through routing circuits (5C) so that the contact point (5G) is arranged in parallel with the first transparent resistive film (5A). When the rear substrate (5) and a front substrate (6) are connected, the contact point (5G) and an expanded region (6Ab) of a second transparent resistive film (6A) on the front substrate (6), which are arranged opposingly with a predetermined gap, form a switch (12) for detecting a contact therebetween, based on a voltage detected in the terminals (6D,5D) of one of the rear substrate (5) and the front substrate (6) when a voltage is applied between the terminals (5D,6D) of the other.