A sealed apparatus comprising a main body (1) having a divisible space (15) the divisible space (15) is divided into a first division space (16) and a second division space (17) by means of the main body (1) the exterior of the main body (1) is covered with light blocking material (4) and/or the light blocking material (4) is sandwiched in the main body (1) the sealed apparatus is provided in a gap between the light blocking materials (4) with a shield (43) that at least blocks one side of the gap and has a length greater than the gap length. The separation of the light blocking material (4) and the light degradable substance to be shielded by means of at least one layer of separation material (42) solves the problem of physiochemical property changes in light degradable substance caused by reactions between the light degradable substance to be shielded and the material in contact with the substance, thereby ensuring the stability of the light degradable substance. The provision of the shield (43) over the gap between light blocking material (4) solves the problem of degradation of light degradable substance under light caused by light entering through the gap, thereby maintaining good light blocking. The sealed apparatus is used in the field of medical packaging material.Dispositif hermétique comprenant un corps (1) doté dun espace (15) séparable, lequel peut être séparé au moyen du corps (1) en un premier espace de séparation (16) et un second espace de séparation (17), le côté externe du corps (1) recouvrant un matériau antiréfléchissant (4) et/ou un matériau antiréfléchissant (4) pressé contre le corps (1). Le dispositif hermétique présente dans lespace intermédiaire laissé par le matériau antiréfléchissant (4) un dispositif de blocage (43) destiné à protéger toute la longueur de lespace intermédiaire et disposé, à cet effet, au-delà de lespace de séparation. Linvention permet de résoudre le problème lié à la réaction que subit le matériau en communication avec
