A voice agent device includes: a position detection unit which detects a position of a person in a conversation space to which the voice agent device is capable of providing information; a voice volume detection unit which detects a voice volume of the person from a sound signal in the conversation space obtained by a sound acquisition unit; a conversation area determination unit which determines a conversation area as a first area including the position when the voice volume has a first voice volume value and determines the conversation area as a second area including the position and being smaller than the first area when the voice volume has a second voice volume value smaller than the first voice volume value, the conversation area being a spatial range where an utterance of the person can be heard; and an information provision unit which provides provision information to the conversation area.