Testing microreactor, testing device and testing method

A micro-reactor for analyzing a sample, comprising:

• (1) a plate-shaped chip;
• (2) a plurality of reagent storage sections each having a chamber to store a reagent and a flow path through which a flow of the reagent is fed from the chamber;
• (3) a reagent mixing section to mix plural flows of reagents fed through respective flow paths from the plurality of reagent storage sections so as to produce a flow of mixed reagent;
• (4) a sample receiving section having an injection port through which a sample is injected from outside;
• and
• (5) a reacting section to mix and react the mixed reagent fed from the reagent mixing section and the sample fed from the sample receiving section;
• wherein the plurality of reagent storage sections, the reagent mixing section, the sample receiving section and the reacting section are incorporated in the chip and are connected through flow paths, and
• wherein the reagent mixing section comprises a mixing flow path in which the plural flows of reagents are mixed, and a feed-out flow path to feed out the flow of mixed reagent to the reacting section, and wherein the feed-out flow path is branched from a middle point of the mixing flow path so that a portion of the mixing flow path between the middle point and a downstream end of the mixing flow path forms a discarding portion into which the leading portion of the flow of mixed reagent is discarded without being fed out to the reacting section.