Provided on an inner surface of a container to carry out polymerase chain reaction (PCR) are an electrode pair 22 to be disposed to face each other with a gap along a flow of a reaction solution interposed therebetween, and an AC voltage is applied to the electrode pair 22 to make an AC current flow through the reaction solution, whereby Joule heat is generated to control the reaction solution in temperature. Accordingly, a PCR method and a PCR device that allow generating sufficient Joule heat for a PCR cycle even when an applied voltage is low, and do not electrolyze a reaction solution even by making an electric current flow through the reaction solution can be provided.