| abstract |
(57) [Summary] [Purpose] To provide a biosensor capable of rapid and stable measurement. A working electrode 12 is formed on the surface of a continuous porous substrate 11, a counter electrode 13 is formed on the back surface thereof, and the continuous porous substrate 11 has a small diameter porous substrate 11 having a pore diameter of about 0.2 μm. It is formed by joining a and a large-diameter porous substrate 11b having a pore diameter of about 100 μm. The enzyme is immobilized in the small diameter porous substrate 11a, and the enzyme is not immobilized in the large diameter porous substrate 11b. With such a structure, the test liquid rapidly enters the large-diameter porous substrate 11b, and the test liquid uniformly enters from the periphery of the small-diameter porous substrate 11a, so that a rapid and stable substrate concentration is obtained. Can be measured. |