A meal intake detection device includes: a detection unit configured to detect a rise of heart rate； a separation unit configured to extract as a meal intake candidate a time range from a detected rise by the detection unit to time when the heart rate decreases to a predetermined value in temporal changes in heart rate, and when a second meal intake candidate is extracted in a time range of an extracted first meal intake candidate, separate the first meal intake candidate and the second meal intake candidate along a predetermined line； and another detection unit configured to detect whether each of the first meal intake candidate and the second meal intake candidate is a meal intake based on feature quantities relating to the first meal intake candidate and the second meal intake candidate separated by the separation unit.
