A mesh decoding device 200 according to the present invention includes: an atlas data decoding unit 207 decodes an atlas bit stream to generate and output control information; a base mesh decoding unit 202 decodes the control information and a base mesh bit stream to generate and output a base mesh; a subdivision unit 203 outputs a subdivision mesh and a subdivision vertex normal line using the control information and the base mesh as inputs; a mesh decoding unit 204 generates a decoded mesh using the control information, a displacement, the subdivision mesh, and the subdivision vertex normal line as inputs; and a boundary correction unit 208 corrects a sub-mesh boundary for the decoded mesh and output a boundary corrected decoded mesh.