To provide a pouch with a spout by which an adapter does not loosen from a spout and the adapter can be resealed using a cap.

In the pouch with the spout including the pouch A with the spout, the adapter 3 having a connection part 5 for connecting a tube member, and a mounting part 6 provided to be connected to the connection part 5 and threadedly engaged with the spout 1, and a screw cap 4 having a cap body 8 threadedly engaged with a thread part 7 of the adapter 3, and an annular part 9 bridged to the cap body 8 via a bridge part 89, the adapter 3 is threadedly engaged with the spout 1 via the mounting part 6, the mounting part 6 is engaged with the spout 1 so as not to be rotated in a loose direction of the adapter 3, the cap body 8 is threadedly engaged with the adapter 3, the annular part 9 is engaged with the adapter 3 so as not to be rotated in a loose direction of the cap body 8, and the bridge part 89 is broken when the cap body 8 is rotated in the loose direction.