To prevent residual expiration and the mix-in of outdoor air.

This device 10 is constituted of a container holding part 2 for freely attachably and detachably holding an expiration sampling container K for enclosing the expiration A, a first collecting tube holding part 3 communicated to the container holding part 2 through the flow passages 51, 52 and 53 of gas for freely attachably and detachably holding one end part of a collecting tube H for sucking specified components in the expiration A, a second collecting tube holding part 4 for freely attachably and detachably holding the other end part of the collecting tube H and a suction pump 11 communicated to the second collecting tube holding part 4 through flow passages 56, 57 and 58 of the gas. In this case, a gas cylinder 6 for a purge for supplying purge gas to the flow passages 51, 52 and 53 between the container holding part 2 and the first collecting tube holding part 3 is equipped.