To provide a sensor unit and a respiratory function test apparatus capable of reducing labor in measuring a respiratory function. A sensor unit includes a case, a holder that can slide with respect to the case, a flow sensor that can be attached to and detached from the holder, and a pressure transmission unit that has a probe and is supported by the case. The flow sensor includes a first tube portion that a person can hold with a mouth, a screen storage portion that has a screen inside and fits in a holder, and a first tube portion that is located on the opposite side of the first tube portion with respect to the screen storage portion. 2 cylinder parts, and the cylindrical connection part which is provided in the outer peripheral surface of the 1st cylinder part and is connected with the inside of a flow sensor. When the holder slides, the connecting portion fits into the probe. [Selection] Figure 9【課題】呼吸機能の測定における手間を低減できるセンサユニット及び呼吸機能検査装置を提供すること。【解決手段】センサユニットは、ケースと、ケースに対してスライドできるホルダと、ホルダに脱着可能なフローセンサと、プローブを有し且つケースに支持される圧力伝達ユニットと、を備える。フローセンサは、人間が口で咥える第１筒部と、内部にスクリーンを有し且つホルダに嵌まるスクリーン収納部と、スクリーン収納部に対して第１筒部とは反対側に位置する第２筒部と、少なくとも第１筒部の外周面に設けられ、フローセンサの内部に繋がる筒状の接続部と、を備える。ホルダがスライドすると、接続部がプローブに嵌まる。【選択図】図９
