Patent ID: 8133456

Claim:
A microreactor having a plate like substrate, the microreactor comprising in the plate like substrate: a reagent storage section; the reagent storage section including: a storage chamber for storing a reagent therein; an inlet which is provided to the storage chamber and through which a driving solution is injected into the storage chamber; and an outlet through which the reagent is pushed out of the storage chamber by the driving solution having been injected, a reagent feed-out flow path which communicates with the reagent storage section through the outlet and through which the pushed out reagent is fed out of the reagent storage section; a first flow path which is provided upstream from the reagent storage section and has a first end and a second end, the first end being connected to the inlet of the reagent storage section so that the first flow path communicates with the storage chamber, and the second end being provided with a first opening which is to be connected to an external pump for feeding the driving solution when the external pump is connected to the substrate; a branch flow path which is branched off from a branch section connected directly to the first end of the first flow path where the first flow path is connected to the inlet; and an air evacuation flow path which is adjacent to the branch flow path so as to extend directly from the branch flow path, and whose distal end has a second opening open to an outside, the air evacuation flow path being configured so that a fluidic resistance of the air evacuation flow path for a liquid is greater than a fluidic resistance, for the liquid, of a flow channel which starts from the branch section as a starting point and includes from the branch section to the reagent feed-out flow path, wherein when the driving solution is fed from the first opening, air in the first flow path and the air evacuation flow path is released from the second opening.