PURPOSE: To embody a multipoint signal measuring device which is capable of reducing the influence of common mode noise.

CONSTITUTION: In a multipoint signal measuring device constituted so as to selectively fetch multipoint measuring signals in a measuring processing part via an input selection part 2 for which semiconductor switches SH, SL are used, the device is composed of a guard shield case 6 formed so as to include the measuring processing part and a guard switch SC provided on the input selection part 2 so as to selectively connect this guard shield case 6 and the input terminal of the low pressure side of each measuring signal.