To provide an independent or combined sealing device at a starting portal and an arrival portal for tunnel construction, easily used without being regulated by the direction of inclination at each of the start portal and arrival portal, being fitted with particularly a plurality of swing members or divided extension parts of a plurality of keep plates through a hinge part so as to be tiltable at an optional angle in a longitudinal direction.

In this independent or combined sealing device at the start portal and arrival portal for tunnel construction, a ring of L-shaped cross section fixed to a pit wall is fitted with a plurality of swing members together with an elastic sealing member or a tube member through the hinge part or a swing part so as to be tiltable at an optional angle in the longitudinal direction, and a ring member fixed to the pit wall is fitted with the own divided extension parts of a plurality of keep plates together with the elastic sealing member or tube member through the hinge part or swing part so as to be tiltable at an optional angle in the longitudinal direction.