Patent ID: 8343428

Claim:
A microchip interiorly including a fluid circuit, the microchip comprising a first substrate with a groove formed on a substrate surface and a plurality of pass-through holes passing in a thickness direction of the substrate, and one or more second substrates laminated on a surface of said first substrate; wherein said fluid circuit includes: a liquid reagent holding portion for accommodating a liquid reagent; one or more measuring portions for measuring said liquid reagent or a specimen; one or more overflow liquid accommodating portions, connected to said measuring portion, for accommodating said liquid reagent or said specimen overflowed from said measuring portion when measuring said liquid reagent or the specimen; and two or more optical measurement cuvettes consisting of a space configured by one pass-through hole of said plurality of pass-through holes and a substrate surface of said second substrate; wherein said two or more pass-through holes configuring said optical measurement cuvettes are arranged on a circumference of a same circle at a surface of said first substrate; and said overflow liquid accommodating portion is arranged on a circumference arranged with said two or more pass-through holes at the surface of said first substrate.