PROBLEM TO BE SOLVED: To provide a breath test device capable of maintaining the pressure and flow rate of breath in a predetermined range when measuring the concentration of a predetermined gas molecule contained in the breath of a subject. SOLUTION: An injection port for injecting exhaled air of a subject, a pressure adjustment nozzle 20 for adjusting the pressure of the exhaled air injected into the injection port to fall within a predetermined pressure range, and the pressure adjustment nozzle. 20. A constant flow rate suction pump 50 which causes the exhaled air whose pressure has been adjusted by 20 to flow at a constant flow rate in the subsequent stage, and a gas concentration sensor 60 which detects the concentration of a predetermined gas molecule contained in the exhaled breath flowing in the subsequent stage by the constant flow rate suction pump 50. And the output unit 71 that outputs information related to the detection result of the gas concentration sensor 60, and the breath inspection apparatus 1 is configured. [Selection diagram] Figure 1【課題】被検者の呼気に含まれる所定ガス分子の濃度測定にあたり、呼気の圧力および流量を一定範囲に維持することができる呼気検査装置を提供する。【解決手段】被検者の呼気が注入される注入口と、前記注入口に注入された呼気の圧力が所定圧力範囲内に属するように調整するための圧力調整ノズル２０と、前記圧力調整ノズル２０で圧力が調整された呼気を一定流量で後段に流す定流量吸引ポンプ５０と、前記定流量吸引ポンプ５０によって後段に流れてくる呼気に含まれる所定ガス分子の濃度を検出するガス濃度センサ６０と、前記ガス濃度センサ６０による検出結果に関する情報を出力する出力部７１と、を備えて、呼気検査装置１を構成する。【選択図】図１
