To provide a box for packaging which is made of a paper being more flexible and thicker than a corrugated paper, can be folded, and is capable of keeping a lid body under an opened condition or a closed condition when it is made into a box condition.

The side face 14 of a lid body formed by folding it on a free end side of the lid body 13 continuously formed from a specified side face 4 of a box main body A consisting of four side faces 1, 2, 3 and 4, is overlapped on the side face 2 being opposite to the side face 4 to which the lid body 13 of the box main body A is continuously formed, and a projected part 14a formed by projecting from the side face 14 of the lid body is freely inserted into and released from a cut and raised channel 2b formed on the side face 2. Simultaneously, a projected piece part 2a formed on the side face 2 is freely inserted and released from a cut channel 14b on the side face 14 of the lid body.