Patent ID: 7767442

Claim:
A biochemical sensor for detecting a prescribed target substance contained in a specimen of liquid phase or gas phase, including: a first layer sensor, and a second layer sensor arranged on said first layer sensor, each of said first layer sensor and said second layer sensor including: a sensor structure wherein a channel is formed to penetrate from a first surface to a second surface of the structure, allowing influx of said specimen, an inner circumferential surface of said channel being comprised of a porous material; and a functional substance carried in said porous material forming the inner circumferential surface of said channel, the functional substance configured to form reactant by interaction with said prescribed target substance; wherein the functional substance carried by said first layer sensor is different from the functional substance carried by said second layer sensor, wherein a cross section of said channel is hexagonal; and, wherein the first layer comprises plural channels and the second layer comprises plural channels, and wherein the channels of the first layer sensor and the channels of the second layer sensor have different sizes.