PURPOSE: To provide an opaque package for stably storing a photosensitive body constituted of a pair of rectangular parallelopiped-like inner box and outer box, which are engaged.

CONSTITUTION: The inner box and the outer box without a base wall are formed by selectively folding board blanks formed in specified forms. In the obtained inner box and the outer box 20 and 70, the inner box 20 is closed by a top wall 30 facing upward and the outer box 70 is slide-fitted in a telescope type from above the inner box by making the top wall 72 face upward. The corresponding front walls 24 and 74, back walls 26 and 76 and both end walls 28 and 78 of the two boxes 20 and 70 are arranged so that they make a sealed facing relation. Thus, the firm opaque package for the photosensitive body A enveloped in the inner box 20 is provided.