Patent ID: 8231265

Claim:
A microchip for forming an emulsion, comprising: a first glass substrate; a second glass substrate; and a silicon substrate provided between the first glass substrate and the second glass substrate, wherein the silicon substrate has formed therein a first fluid flow path through which a first fluid flows and a second fluid flow path through which a second fluid that is not mixed with the first fluid flows, the first fluid flow path has a plurality of branched flow paths that join at a joint portion, the second fluid flow path has an edge portion that communicates with the joint portion, the silicon substrate has formed therein an emulsion formation flow path to form an emulsion composed of the first fluid and the second fluid that is surrounded by the first fluid, the emulsion formation flow path facing the edge portion of the second fluid flow path; the silicon substrate has a restricting portion formed between the joint portion and the emulsion formation flow path, and surfaces of the restricting portion, which are parallel to a flow direction of the restricting portion, are entirely surrounded by the silicon substrate.