Patent ID: 7622026

Claim:
A biosensor comprising: first and second supports bonded together to form a space between the supports as a specimen supply path, the space between the supports having a specimen-drawing opening to outside the biosensor through which a supplied specimen is drawn into the space between the supports so as to react with a reagent disposed in the specimen supply path; an air hole formed in the second support and leading from the specimen supply path to the outside of the biosensor, a diameter of an opening of the air hole at one surface of the second support which faces the specimen supply path being larger than a diameter of an opening of the air hole at the other surface of the second support, the air hole being located at a position different from the position of the specimen-drawing opening of the space between the supports so as to accelerate the drawing of the specimen into the space between the supports, wherein the area of the opening of the air hole at the one surface of the second support facing the specimen supply path is 1.76×10 −2 ˜3.14×10 −2 mm 2 , and the area of the opening at the other surface of the second support is 1.96×10 −3 ˜7.85×10 −3 mm 2 .