a polymerase chain reaction apparatus includes a pcr chip holder which accommodates and supports a pcr chip , a housing which supports ends of the pcr chip holder , a temperature control element which moves perpendicularly with respect to the pcr chip holder in a space between the housing and the pcr chip holder in the housing , and an elastic unit which elastically biases the temperature control element toward the pcr chip holder , between the temperature control element and the housing . the temperature control element includes a top surface which is selectively contacted to a bottom surface of the pcr chip .