A device for extracting a nucleic acid from a biological specimen, comprising: a substrate; a chip support being arranged on the top surface of the substrate and including a chip receiving portion having the shape of a plate with a horizontal surface in close contact with a bottom surface of a microfluidic chip for nucleic acid extraction; a heater in form of a contact plate type heating block, the heater being arranged on the horizontal surface of the chip receiving portion and made to apply heat to a part of the whole bottom surface of the microfluidic chip for nucleic acid extraction installed in the chip receiving portion; anda microfluidic chip for nucleic acid extraction having the shape of a plate with a top horizontal surface and a bottom horizontal surface, wherein the microfluidic chip comprises: an inlet portion to receive a biological specimen; an outlet portion to retrieve extracted nucleic acid; a channel connecting the inlet portion and the outlet portion; a first filter and a second filter, wherein the first filter and the second filter are arranged within the channel and wherein the first filter and the second filter are configured to allow a substance having an equivalent size of a nucleic acid to pass through; a nucleic acid separating portion, wherein said nucleic acid separating portion is located between the first filter and the second filter, and wherein said nucleic acid separating portion comprises a nucleic acid binding substance capable of specifically binding nucleic acid; and a heating portion, wherein the heating portion is arranged within the channel and is situated between the inlet portion and the first filter, wherein the heating portion is configured to transfer heat obtained from the heater to a biological specimen introduced through the inlet portion. a substrate; a chip support being arranged on the top surface of the substrate and including a chip receiving portion having the shape of a plate with a horizontal surface in close contact with a bottom surface of a microfluidic chip for nucleic acid extraction; a heater in form of a contact plate type heating block, the heater being arranged on the horizontal surface of the chip receiving portion and made to apply heat to a part of the whole bottom surface of the microfluidic chip for nucleic acid extraction installed in the chip receiving portion; anda microfluidic chip for nucleic acid extraction having the shape of a plate with a top horizontal surface and a bottom horizontal surface, wherein the microfluidic chip comprises: an inlet portion to receive a biological specimen; an outlet portion to retrieve extracted nucleic acid; a channel connecting the inlet portion and the outlet portion; a first filter and a second filter, wherein the first filter and the second filter are arranged within the channel and wherein the first filter and the second filter are configured to allow a substance having an equivalent size of a nucleic acid to pass through; a nucleic acid separating portion, wherein said nucleic acid separating portion is located between the first filter and the second filter, and wherein said nucleic acid separating portion comprises a nucleic acid binding substance capable of specifically binding nucleic acid; and a heating portion, wherein the heating portion is arranged within the channel and is situated between the inlet portion and the first filter, wherein the heating portion is configured to transfer heat obtained from the heater to a biological specimen introduced through the inlet portion. an inlet portion to receive a biological specimen; an outlet portion to retrieve extracted nucleic acid; a channel connecting the inlet portion and the outlet portion; a first filter and a second filter, wherein the first filter and the second filter are arranged within the channel and wherein the first filter and the second filter are configured to allow a substance having an equivalent size of a nucleic acid to pass through; a nucleic acid separating portion, wherein said nucleic acid separating portion is located between the first filter and the second filter, and wherein said nucleic acid separating portion comprises a nucleic acid binding substance capable of specifically binding nucleic acid; and a heating portion, wherein the heating portion is arranged within the channel and is situated between the inlet portion and the first filter, wherein the heating portion is configured to transfer heat obtained from the heater to a biological specimen introduced through the inlet portion.