MELTING CURVE ANALYZING METHOD AND MELTING CURVE ANALYZING DEVICE

The present invention provides a melting curve analyzing method that can automatically analyze whether or not a peak is present in at least one of two temperature ranges. A signal differential value (A) having a maximum absolute value is searched for among signal differential values at respective temperatures. When a temperature (t 1 ) indicating (A) is included in a temperature range (T 1 ) that is either one of a predetermined temperature range T H and a predetermined temperature range T L , it is determined that (A) is a first peak. Further, a signal differential value (C) that is a first signal differential value after the absolute value changed from decreasing to increasing and a signal differential value (D) having an absolute value that is greatest next to the absolute value of (A) are searched for. When X = (A - C)/(D - C) satisfies a condition [X < predetermined threshold value] and a temperature (t 2 ) indicating (D) is included in a temperature range (T 2 ), it is determined that the signal differential value (D) is a second peak. When X satisfies a condition [X ‰¥ predetermined threshold value], Y = Y 1 /Y 2 is calculated from an integral value (Y 1 ) of signal differential values in the temperature range (T 1 ) and an integral value (Y 2 ) of signal differential values in the temperature range (T 2 ). When Y satisfies a condition [1 ‰¤ Y ‰¤ predetermined threshold value], it is determined that (D) is the second peak.