To provide a gas flow measurement device and measurement method which have a stable and adequate responsiveness to a gas flow without being influenced by changes in the ambient environment and, in particular, can measure the respiratory rate of a living animal.SOLUTION: The gas flow measurement device comprises: 1) a sensor element which has a first electrode, a second electrode, an insulative base material, and a thin film layered on the insulative base material and extending between the electrodes, the electroconductivity of the thin film changing with the moisture contained in a gas flow in the vicinity of the thin film； 2) an electric resistance element having an electroconductivity change characteristic of the same tendency as the electroconductivity change characteristic in response to the moisture in the sensor element； 3) a power source with the sensor element and the electric resistance element connected in series and applying a direct current thereacross； and 4) a signal processing unit for inputting an electric signal waveform at a connection midpoint of the serial connection. The electric resistance element of 2) acts at an electroconductivity in response to the moisture of the ambient environment without being influenced by the moisture contained in the gas flow. The signal processing unit of 4) measures the state of the gas flow on the basis of the electric signal waveform at the connection midpoint.SELECTED DRAWING: Figure 1【課題】周囲環境の変化に影響を受けず、安定的に、ガス流に対して十分な応答性を有し、特に、生体動物の呼吸数の計測を行える計測装置及び計測方法を提供する。【解決手段】１）第１電極と、第２電極と、絶縁性基材と、絶縁性基材に積層され、電極間に延在する薄膜とを有し、薄膜近傍のガス流に含まれる湿気により薄膜の電気伝導度が変化するセンサ素子、２）上記のセンサ素子における湿度に応じた電気伝導度の変化特性と同傾向の電気伝導度の変化特性を有する電気抵抗素子、３）センサ素子と電気抵抗素子が直列接続され、その両端に直流電圧を印加する電源、４）直列接続の接続中点の電気信号波形を入力する信号処理部、を備える。上記２）の電気抵抗素子は、ガス流に含まれる湿気による影響を受けず、周囲環境の湿度に応じた電気伝導度で作用するものであり、上記４）の信号処理部は、接続中点の電気信号波形に基づいて、ガス流の状態を計測する。【選択図】図１
