To provide an inexpensive mouthpiece of a purse with simple structure, the opening of which can be reinforced and precisely opened and closed, and to which a user can attach his personal ornament and a functional structure can be given to prevent the purse from being lost.

A mouthpiece body 1 attached to an opening of a purse, wherein the opening can be reinforced and opened and closed by means of engaging parts 5, 5 which can be releaseably engaged with each other, comprises a pair of gate-shaped fittings 2, 2 each having the engaging part 5 on the upper side of the fitting 2. Ends of legs of the fittings 2, 2 are connected through hinge pins. A string hole 6 is provided on one of the sides of one of the fittings 2, 2.