An utterance state detection apparatus includes a transmission device carried by a user and one or more reception devices. The transmission device includes an identification-information storage unit, a speech detector and a transmission unit. The identification-information storage unit stores identification information of at least one of the transmission device and the user. The speech detector detects speech. The transmission unit transmits transmission information including information of the detected speech and the identification information. The reception devices are installed in regions. Each reception device includes an utterance-state detector. If at least one of the reception devices receives the transmission information, the utterance-state detector of the at least one of the reception devices detects an utterance state of the user based on the identification information and the information of the detected speech, which are included in the transmission information received by the at least one of the reception devices.