The objective of the present disclosure is to make it possible to estimate a target of attention of a communication party, even if a plurality of items having the same appearance are present in a space. An attention target estimating device 10 according to the present disclosure acquires a first-person viewpoint image IMi captured on the line of sight of a person, and a gaze location gi of the person when the first-person viewpoint image IMi was captured, determines the location in three-dimensional space of objects 31, 32, 33 extracted from the first-person viewpoint image IMi, and determines that an object close to the gaze location gi of the person, among the objects 31, 32, 33 included in the first-person viewpoint image IMi, is the target of attention of the person.
ATTENTION TARGET ESTIMATING DEVICE, AND ATTENTION TARGET ESTIMATING METHOD