The eating and drinking action detection apparatus: acquires vibration produced from inside of a body of a subject and generates a vibration signal corresponding to the vibration； divides the vibration signal into each frame to calculate power of the vibration signal for each frame； determines, for each frame, whether the frame is a stationary signal having a periodicity or a non-stationary signal having no periodicity； detects, based on the power of each frame and a determination result for each frame whether the frame is the stationary signal or the non-stationary signal, a period of the non-stationary signal being continued while the power of the vibration signal is equal to or larger than a power threshold, acquires a continuation time of the period； and determines, based on the continuation time, whether the subject performed swallowing or mastication in the period of the non-stationary signal being continued.
