electrode the y electrode 202 of fig4 a and 4b and the detection electrode for sensor the x electrode 201 of fig4 a and 4b are provided a mutual capacity 601 is formed between the electrodes herein only one detection electrode for sensor rx_n the x electrode 201 of fig4 a and 4b is noticed furthermore six tx_ 1 to 6 counter electrodes the y electrodes 202 of fig4 a and 4b are provided the counter electrode the y electrode 202 of fig4 a and 4b has an earth capacity 601 herein since the earth capacity of the detection electrode for sensor of rx_n the x electrode 201 of fig4 a and 4b has the electrode structure described in fig4 a and 4b substantial mutual capacity 601 is obtained in the touch panel control unit 108 a voltage control unit having a pair of switching elements of s 1 and s 2 is provided with respect to each counter electrode the y electrode 202 of fig4 a and 4b furthermore herein the voltage to be controlled is set to two voltage levels of vtxh and vtxl furthermore the detection electrode for sensor of rx_n the x electrode 201 of fig4 a and 4b is connected to the detection circuit unit via a pair of switching elements of s 3 and s 4 in addition in fig6 a and 6b the detection circuit unit is constituted by the integration circuit furthermore in fig6 a and 6b the voltage level of the reference voltage of the integration circuit is shown by vref and the voltage level of the output voltage of the integration circuit is shown by vo hereinafter the control of the mutual detection will be.