1. A touch sensor device comprising: a transparent conductive layer configured to include an impedance surface, the impedance surface including an active area where a human body touches or approaches; a plurality of detection electrodes arranged on the impedance surface; a detection circuit configured to detect electric currents flowing into the detection electrodes; a memory configured to store reference standardized values, and reference normalized values, and reference coordinates at a plurality of locations in the active area, each of the reference standardized values being a ratio of a first value to a second value, the first value obtained by performing arithmetic processing on at least two detected electric currents detected by the detection circuit on each of the reference coordinates being pointed with one pointer, the second value obtained by performing arithmetic processing on at least four detected electric currents detected by the detection circuit on each of the reference coordinates, the reference coordinates being pointed with one pointer, the reference standardized values corresponding to the reference coordinates, respectively, each of the reference normalized values being calculated by normalizing the detected electric currents so as to make a total sum of the electric currents flowing through the impedance surface a constant value, for each of the reference coordinates, each of the reference normalized values corresponding to the reference coordinates, respectively, and a central processing unit (CPU) configured to obtain standardized values by calculating a ratio of a third value to a fourth value in a detection period, the third value obtained by performing arithmetic processing on at least two detected electric currents detected b the detection circuit, the fourth value obtained by detection circuit, map the standardized values onto position coordinates according to a correspondence between the reference standardized values and the reference coordinates, map the position coordinates onto first normalized values according to a correspondence between the reference coordinates and the reference normalized values, calculate second normalized values by normalizing the electric currents detected by the detection circuit in each detection period, and detect a motion of a plurality of pointers on a basis of a time variation of the first normalized values and the second normalized values.