PROBLEM TO BE SOLVED: To evaluate a state of communication between a plurality of persons conversing with each other.SOLUTION: A conversation evaluation device 2 comprises a reception unit 21, a centroid calculation unit 22, and an evaluation unit 27. The reception unit 21 receives detection results detected by three or more pressure sensors disposed on each of the predetermined number N chairs 1. The centroid calculation unit 22 calculates the whole weight WT applied to a seating face of each chair 1 and a centroid position P(X,Y) of the whole weight WT, from the received detection results. The evaluation unit 27 evaluates a state of communication between the predetermined number N persons conversing with each other, each of which sits on each of the predetermined number N chairs 1, on the basis of the whole weight WT and the centroid position P(X,Y).SELECTED DRAWING: Figure 1
