Provided is an accessory accommodation box which can be directly assembled and which does not take up storage space. The present invention comprises: a rectangular plate-shaped main body piece (6) which comprises a front flap surface, a top lid surface, a back surface, a bottom surface, and a front surface, and which is provided with a fold between each surface; a left side surface piece (7) which comprises a side part, a pasting margin, and a corner part on both sides, and which is provided with a fold between each part and a fold extending diagonally from the starting point of each corner part, a diagonal half of one of the corner parts being adhered to the back surface and a diagonal half of the other corner part being adhered to the front surface, and the pasting margin being adhered to the bottom surface; a right side surface piece (8) which comprises a side part, a pasting margin, and a corner part on both sides, and which is provided with a fold between each part and a fold extending diagonally from th
