A capacitive sensor device, comprising: a capacitive sensor comprising pairs (Es) of electrodes (11, 12) arranged in a matrix, each of the pairs (Es) of electrodes (11, 12) being disposed to face each other with a distance therebetween, and an elastically deformable dielectric layer arranged between each of the pairs (Es) of electrodes (11, 12); an AC source; an input switching circuit which is constituted by a plurality of switches (30a to 30i), one end of each of the switches (30a to 30i) is connected to the AC source and the other end of each of the switches (30a to 30i) is connected to a corresponding one of the first electrodes, wherein the input switching circuit is configured to connect a plurality of electrodes selected from the first electrodes to the AC source, while disconnecting others of the first electrodes from the AC source; an output switching circuit which is constituted by a plurality of switches (40a to 40i); a capacitance measuring part, wherein one end of each of the switches (40a to 40i) of the output switching circuit is connected to a corresponding one of the second electrodes and the other end of each of the switches (40a to 40i) of the output switching circuit is connected to the capacitance measuring part, wherein the output switching circuit is configured to connect a plurality of electrodes selected from the second electrodes to the capacitance measuring part, while disconnecting others of the second electrodes from the capacitance measuring part so as to measure a first capacitance of a first electrode pair group (Eg(X1 to X2, Y1 to Y2)) including a selected one (Es(X2, Y2)) of the pairs (Es) of electrodes (11, 12), and a second capacitance of a second electrode pair group (Eg(X1 to X2, Y2 to Y3)) including the selected pair (Es(X2, Y2)); and an external force calculating part for calculating magnitude of external force applied to position of the selected pair (Es(X2, Y2)) of electrodes (11, 12) based on the first capacitance and the second capacitance; wherein the first electrode pair group (Eg(X1 to X2, Y1 to Y2)) comprises a plurality of adjoining ones of the pairs (Es) of electrodes (11, 12); and the second electrode pair group (Eg(X1 to X2, Y2 to Y3)) comprises a plurality of adjoining ones of the pairs (Es) of electrodes (11, 12). a capacitive sensor comprising pairs (Es) of electrodes (11, 12) arranged in a matrix, each of the pairs (Es) of electrodes (11, 12) being disposed to face each other with a distance therebetween, and an elastically deformable dielectric layer arranged between each of the pairs (Es) of electrodes (11, 12); an AC source; an input switching circuit which is constituted by a plurality of switches (30a to 30i), one end of each of the switches (30a to 30i) is connected to the AC source and the other end of each of the switches (30a to 30i) is connected to a corresponding one of the first electrodes, wherein the input switching circuit is configured to connect a plurality of electrodes selected from the first electrodes to the AC source, while disconnecting others of the first electrodes from the AC source; an output switching circuit which is constituted by a plurality of switches (40a to 40i); a capacitance measuring part, wherein one end of each of the switches (40a to 40i) of the output switching circuit is connected to a corresponding one of the second electrodes and the other end of each of the switches (40a to 40i) of the output switching circuit is connected to the capacitance measuring part, wherein the output switching circuit is configured to connect a plurality of electrodes selected from the second electrodes to the capacitance measuring part, while disconnecting others of the second electrodes from the capacitance measuring part so as to measure a first capacitance of a first electrode pair group (Eg(X1 to X2, Y1 to Y2)) including a selected one (Es(X2, Y2)) of the pairs (Es) of electrodes (11, 12), and a second capacitance of a second electrode pair group (Eg(X1 to X2, Y2 to Y3)) including the selected pair (Es(X2, Y2)); and an external force calculating part for calculating magnitude of external force applied to position of the selected pair (Es(X2, Y2)) of electrodes (11, 12) based on the first capacitance and the second capacitance; wherein the first electrode pair group (Eg(X1 to X2, Y1 to Y2)) comprises a plurality of adjoining ones of the pairs (Es) of electrodes (11, 12); and the second electrode pair group (Eg(X1 to X2, Y2 to Y3)) comprises a plurality of adjoining ones of the pairs (Es) of electrodes (11, 12).