Patent ID: 7229540

Claim:
A biochip comprising: a platy member, by which a sample is directly received inside a sample separation passage via injection holes without requiring a sample introductory passage, and comprising a discharge hole; and a seal member connected to said platy member, comprising a sample introductory nozzle at a position corresponding to said injection hole, and another discharge hole at a position corresponding to said discharge hole of said plaly member, wherein said seal member comprises an introductory electrode in said sample introductory nozzle, and electric circuits electrically connected to said introductory electrode on a surface of another side of said seal member from a side where said seal member is fixed on said platy member, wherein said platy member comprises electrophoretic electrodes, respectively provided at positions of said injection hole and said discharge hole of said platy member, wherein when a voltage is applied to said introductory electrode and said electrophoretic electrode of said injection hole of said platy member, a small amount of said sample may be electrically dropped into said sample separation passage of said platy member.