Patent ID: 8404193

Claim:
A microchip comprising: a resinous base having at least one cylindrical part protruding from a surface of a substrate, a plurality of fine channels being formed on another surface of the substrate, and a through-hole penetrating the at least one cylindrical part along an axis of the at least one cylindrical part such that a diameter of an inner wall of the through-hole gradually decreases from a tip end of the at least one cylindrical part to a fine channel of the plurality of fine channels at a first inclination angle and in communication with the fine channel; and a resinous covering member bonded to the other surface of the resinous substrate on which the plurality of fine channels is formed; wherein the microchip is configured to introduce a liquid sample from the tip end of the at least one cylindrical part through the through-hole; wherein the at least one cylindrical part is formed in an approximate truncated cone shape; wherein a diameter of an outer wall of the at least one cylindrical part is gradually increased at a second inclination angle from the tip end of the at least one cylindrical part toward the other surface; wherein the outer wall of the at least one cylindrical part is formed such that the second inclination angle is greater than 0 degree without exceeding 5 degrees; and wherein an inner wall of the at least one cylindrical part is formed such that an absolute value of the first inclination angle is greater than that of the second inclination angle.