To provide a wide-mouthed container capable of easily opening a lid by releasing the fitting of a fitting mouth part of a container body to a lid body by a single hand operation.

In the wide-mouthed container comprising the container body with an upper end of a side peripheral wall forming the fitting mouth part and the lid body having the side peripheral wall engaged with the fitting mouth part, a projecting flange with a projection part projected therefrom is provided on the fitting mouth part of the container body, and a projecting flange with an fitting hole with the projection part engaged therein is provided on a lower end of the side peripheral wall of the lid body.