To provide a spout plug capable of easily checking any illegal unsealing, and simplifying and miniaturizing its structure.

The spout plug includes a base cap 2 which has a shaft part 2c erected at a center of a top face part 2b, and fixed to and held by the neck part 1a of a container 1, and a spout head 6 which is turnably fitted to and held by the shaft part 2c of the base cap 2, and has at least one nozzle which communicates with an internal passage formed on the inner side of the base cap 2 by the turn around the shaft part 2c to spout the content in the container 1. A small groove 8 formed along a top face wall part 2c2 to divide the top face wall part 2c2 into two portions is formed in the top face wall part 2c2 of the shaft part 2c. A bar-shaped member 9 is provided on the spout head 6, which is inserted in the small groove 8 to prevent any turn of the spout head 6, and broken by the forcible turn of the spout head 6.