Patent ID: 8075853

Claim:
A microchip comprising a first substrate bonded to a second substrate and including a groove on its surface, the microchip further comprising: a fluid circuit defined by said groove and a surface of said second substrate closer to said first substrate therein, wherein said fluid circuit includes a separation portion for separating a first component from a fluid containing at least said first component and a second component, said separation portion includes a substantially V-shaped region surrounded by points P 1 , P 2 , P 3 , P 4 , P 5 and P 6 arranged clockwise as viewed from the thickness direction of said first substrate, said substantially V-shaped region is a region formed by a flow channel wall W 2 having a wall surface passing through the point P 2 and the point P 3 , a flow channel wall W 3 having a wall surface passing through the point P 3 and the point P 4 , a flow channel wall W 4 having a wall surface passing through the point P 4 and the point P 5 , a flow channel wall W 5 having a wall surface passing through the point PS and the point P 6 , and a flow channel wall W 6 having a wall surface passing through the point P 6 and the point P 1 , and an external angle formed by the wall surface of said flow channel wall W 2 passing through the point P 2 and the point P 3 and the wall surface of the flow channel wall W 3 passing through the point P 3 and the point P 4 and an internal angle formed by the wall surface of said flow channel wall W 5 passing through the point P 5 and the point P 6 and the wall surface of the flow channel wall W 6 passing through the point P 6 and the point P 1 are less than 180 degrees respectively.