Face structure estimation device, face structure estimation method, and face structure estimation program

A face structure estimation device (10) is provided with an acquisition unit (11) and a control unit (13). The acquisition unit (11) acquires a face image. The control unit (13) functions as an estimation unit (16). The estimation unit (16) estimates a face structure on the basis of the face image. The control unit (13) tracks the start feature point constituting the face structure by a predetermined tracking algorithm in a face image of a frame subsequent to the frame of the face image used in the estimation of the face structure. The control unit (13) finds a result feature point by tracking the tracked feature point with a predetermined algorithm in the face image of the original frame. The control unit (13) screens the face image in which the interval between the result feature point and the start feature point is equal to or less than a threshold value for learning. The control unit (13) causes the estimation unit to learn using the face image screened for learning and the face structure estimated by the