To provide a sealing/packaging container by which the freshness of an egg right after it is laid is kept for a long time, and an egg whose fresh ness is maintained.

In producing this sealing/packaging container 1, a cover part 3 and a container main body 2 formed with three dimensional projections and recesses suitable for storing eggs are integrally formed using a synthetic resin material provided with a gas barrier characteristic. The cover part 3 and the main body 2 are joined by a joining part 4 formed with a folding line 11 with no force of repulsion. An adhesive agent layer 12 is formed in the flange 9 of either the cover part 3 or main body 2.