PROBLEM TO BE SOLVED: To provide a biological information detector which can determine its attached state and its detached state accurately by using change values of DC components of pulse wave sensor signals in prescribed periods.SOLUTION: A biological information detector includes: a pulse wave detecting part 10 which outputs pulse wave sensor signals and a processing part 100 which processes the pulse wave sensor signals. The processing part 100 performs a removal detection process of the biological information detector on the basis of the change values of the DC components of the pulse wave sensor signals in a prescribed period.
