An evaluation device 10 includes facial skin temperature acquisition means 20, brain activity estimation means 30, and evaluation means 200. The facial skin temperature acquisition means 20 acquire facial skin temperature data in time-series. The facial skin temperature data includes skin temperature data detected from the facial surface of the subject and position data of the detection site of the skin temperature data. The brain activity estimation means 30 obtain a plurality of components by decomposing the facial skin temperature data by singular value decomposition, principal component analysis, or independent component analysis, and then estimate the brain activity of the subject on the basis of this plurality of components. The evaluation means 200 evaluate the degree of interest of the subject on the basis of the brain activity of the subject estimated by the brain activity estimation means 30.
