To provide a "fixing/holding holder" capable of attaching a multi-purpose assembly-type paper box with arbitrary dimensions (such as a tissue paper box) to various places such as a desk, a locker, or a chair in an office, or in the periphery of a refrigerator.

The "fixing/holding holder" has a structure of an "inter-sheet insertion hook". The structure of the "inter-sheet insertion hook" is to insert an "inter-sealing sheet openable hook" into the gap between sheets at a corner of a paper box as seen in the structure of most assembly-type paper boxes, and to hold and fix the box by inhibiting the forward/backward movement of the box.