A Fe
3O
4 film prepared by ferrite plating exhibited, in an aqueous solution, a potential depending linearly on pH (=5_??_8) at a rate of -55 mV/pH with a short response time (several seconds), advantageous for practical applications to an electrode-type sensor. Fixing urease on the Fe
3O
4 film intermediated by dextran ((C
6H
12O
5)n,
n=1200_??_1800), we made a urea-sensor. The output potential in-creases monotonically as the urea concentration changes in the range 10
-5_??_10
-1 g/m
l, with a sensitivity of 30 mV per factor of 10 change in urea concentration. The sensor has the remakable feature of requiring no impedance transducer or FET, since the Fe
3O
4 ion-sentitive film is conductive.
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