Provided is a solid oxide cell including a fuel electrode layer, electrolyte layer and an air electrode layer, wherein a diffusion barrier layer is provided between the air electrode layer and the electrolyte layer, the diffusion barrier layer includes: a first diffusion barrier layer formed on the electrolyte layer and including a sintered ceria-based metal oxide containing no sintering aid; and a second diffusion barrier layer formed on the first diffusion barrier layer and including a sintered product of a ceria-based metal oxide mixed with a sintering aid, the first diffusion barrier layer includes a sintered product of nanopowder and macropowder of a ceria-based metal oxide, and the first diffusion barrier layer and the second diffusion barrier layer are sintered at the same time. The diffusion barrier layer is densified, shows high interfacial binding force and prevents formation of a secondary phase derived from chemical reaction with the electrolyte.