Patent ID: 8486336

Claim:
A microchip comprising: a first substrate and a second substrate, said first substrate being superposed on and bonded to said second substrate and having a surface with a groove; and a fluid circuit composed of a cavity defined by said groove and a surface on said first substrate side of said second substrate, wherein said fluid circuit includes a fluid retaining reservoir for containing a liquid reagent, said first substrate has a fluid inlet for injecting the liquid reagent into said fluid retaining reservoir, said fluid inlet is a through opening extending through said first substrate from a surface opposite to said surface with the groove of said first substrate to said fluid retaining reservoir, and said fluid retaining reservoir includes: a fluid outlet or outflow channel for allowing the liquid reagent to flow out; and a partition dividing said fluid retaining reservoir into a first region including said fluid inlet and a second region including said fluid outlet or outflow channel, wherein said partition includes at least one communication gate for allowing communication between said first region and said second region, and wherein said fluid circuit further includes a measuring portion for measuring the liquid reagent that has been discharged from said fluid outlet or outflow channel.