Disclosed herein is a nucleic acid amplifier (1) for carrying out a nucleic acid amplification reaction, the amplifier including at least: a plurality of wells (A1) configured to carry out the nucleic acid amplification reaction; a heating unit (12) provided for every well (A1); optical means (14,15) capable of irradiating excitation light of a specified wavelength to all of the wells (A1); and a fluorescence detection unit (16) provided for every well (A1).
