To reduce error caused by difference in measurement conditions of every one point, improve measurement accuracy, and improve searching efficiency by providing a plurality of electrodes for detecting electric signals related to vital impedance on the vital surface and two-dimensionally arranging these electrodes on a holding body at prescribed intervals.

When a device is started, at first, an electric pulse is generated by a pulse generation circuit 21 by a reference pulse CK from a reference pulse generation circuit 5 and then a control signal S1 is generated by the first control signal generation part 22. The electric pulse is fed to electrodes a1... an in order which are arranged two-dimensionally in prescribed intervals in an array electrode 1 and the electric signal is fed to a measurement system 3 as a voltage signal V3 via a resistance R3. This voltage signal V3 is displayed on a monitor 35 as information of vital information based on two-dimensional vital impedance PZ, namely a pressure point, via an integrating circuit 31, a hold circuit 32, an amplifier 33, and a DSC.