Flexible board for forming package

A flexible board for forming a package, said flexible board, developed in a plane, comprising:

• a body portion that has a rear body piece, a left-side body piece, a front body piece, and a right-side body piece, which are rectangular, and which are connected to each other to form a strip shape;
• a big bottom piece that is approximately rectangular and is connected to a lower side of said rear body piece, a vertical length of said big bottom piece being approximately equal to a horizontal length of said left-side body piece, said big bottom piece having an insert piece at a tip portion thereof;
• a small bottom piece that is connected to a lower side of said front body piece, and that has a strip piece extending along said front body piece, and first and second projecting pieces projecting from both ends of said strip piece in the opposite direction to said front body piece;
• a left-side bottom piece that is connected to a lower side of said left-side body piece, and that is formed with a first cut-out section at a portion corresponding to said first projecting piece;
• and
• a right-side bottom piece that is connected to a lower side of said right-side body piece, and that is formed with a second cut-out section at a portion corresponding to said second projecting piece;
• the length of said insert piece in a direction along said rear body piece being shorter than the distance between said first and second projecting pieces, and a vertical length of each of said left-side and right-side bottom pieces being approximately half a horizontal length of the front body piece.