PURPOSE: To improve the durability of an input panel, and also, to prevent deterioration in the detection accuracy of a coordinate position, by providing plural switching means consisting of plural diodes, a pen potential detecting circuit and a dividing circuit, etc.

CONSTITUTION: In case of applying a voltage to an input panel 1 from a driving signal generator 10, if its voltage is negative, diodes 61W6n and 71W7n conduct, and diodes 81W8n and 91W9n go to no-conducting. Subsequently, on a resistance layer of the panel 1, a potential inclination which is varied linearly in its X axis direction is formed. On the other hand, when the generator 10 has generated a positive voltage, the diodes 81W8n and 91W9n conduct, the diodes 61W6n and 71W7n go to non-electrifying, and on the resistance layer of the panel 1, a potential inclination which is varied linearly in its Y axis direction is formed. In such a way, a contact position of an input pen 15 can be derived as a point on the X and Y coordinates through a pen potential detecting circuit 12 and a dividing circuit 13, etc. Accordingly, the durability of the input panel can be improved, and also, the detection accuracy of the coordinate position can be prevented from its deterioration.