When recalling specific scenes later in life, we recall scenes that made a strong impression on us. A tagging system based on emotional swings is needed as a method to retrieve specific scenes from a long-time life log with less invasiveness to the user. In this paper, in addition to a wearable device, sensors are installed in the surrounding environment to estimate emotions. We propose a lifelog tagging system based on emotional swings using heart rate, fingertip temperature, and thirst. As an example of a lifelog, we tagged a horror movie, which tends to show emotional ups and downs. Many of the scenes in which we felt emotional swings were impressive scenes, and we believe that this is an effective tagging system. In the future, it is necessary to increase the elements used to estimate emotions and conduct daily experiments that include emotions other than fear.