A method for fabricating a microchip for nucleic acid amplification reaction, the method comprising: a solidification step (S3a) of drying in a solidification container a plurality of reagent solutions including at least a part of substances required for a nucleic acid amplification reaction, wherein the solidification step includes a step of freeze-drying (S3a-2) the plurality of reagent solutions; a containment step of arranging the solidified reagent solutions in wells that serve as a reaction site for a nucleic acid amplification reaction; and a preparation step of readying, prior to the solidification step, the plurality of the reagent solutions that have different compositions, wherein the plurality of reagent solutions include a first reagent solution that includes an oligonucleotide primer but not an enzyme, and a second reagent solution that includes an enzyme but not an oligonucleotide primer, wherein during the containment step, both the first reagent solution and the second reagent solution are arranged in each well, wherein, for each one of the plurality of reagent solutions, the step of freeze-drying comprises: a freezing step carried out at a temperature equal to or lower than the freezing point of that one of the plurality of reagent solutions; a primary drying step wherein the one of the plurality of reagent solutions frozen in the pre-freezing step is dried; and a secondary drying step wherein water in a molecular state that is adhered to components included in the one of the plurality of reagent solutions after the primary drying is removed, and wherein the step of performing freeze-drying is performed individually for each of the plurality of reagent solutions. a solidification step (S3a) of drying in a solidification container a plurality of reagent solutions including at least a part of substances required for a nucleic acid amplification reaction, wherein the solidification step includes a step of freeze-drying (S3a-2) the plurality of reagent solutions; a containment step of arranging the solidified reagent solutions in wells that serve as a reaction site for a nucleic acid amplification reaction; and a preparation step of readying, prior to the solidification step, the plurality of the reagent solutions that have different compositions, wherein the plurality of reagent solutions include a first reagent solution that includes an oligonucleotide primer but not an enzyme, and a second reagent solution that includes an enzyme but not an oligonucleotide primer, wherein during the containment step, both the first reagent solution and the second reagent solution are arranged in each well, wherein, for each one of the plurality of reagent solutions, the step of freeze-drying comprises: a freezing step carried out at a temperature equal to or lower than the freezing point of that one of the plurality of reagent solutions; a primary drying step wherein the one of the plurality of reagent solutions frozen in the pre-freezing step is dried; and a secondary drying step wherein water in a molecular state that is adhered to components included in the one of the plurality of reagent solutions after the primary drying is removed, and a freezing step carried out at a temperature equal to or lower than the freezing point of that one of the plurality of reagent solutions; a primary drying step wherein the one of the plurality of reagent solutions frozen in the pre-freezing step is dried; and a secondary drying step wherein water in a molecular state that is adhered to components included in the one of the plurality of reagent solutions after the primary drying is removed, and wherein the step of performing freeze-drying is performed individually for each of the plurality of reagent solutions.