To provide a jaw press for pressing the jaw in such a way that the mouth is not opened until rigor mortis occurs.

A main body is characterized by being a hollow body whose plane shape is an approximately C-shape or an approximately U-shape and the apex parts facing each other and providing a valve at an appropriate position of the main body and making it possible to expand it by feeding air from the valve or to compress it by releasing the air from the valve. It is preferable that a pressure-sensitive adhesive layer with a release paper is provided at an appropriate position of the main body by preventing displacement from occurring while it is used. It is prevented from occurring that the mouth is opened until rigor mortis occurs by using it by winding it on the neck and supporting the jaw from the lower side.