To provide a solid electrolyte feul cell and its manufacturing method by which power generating performance and reliability' can be enhanced.

In a unit fuel cell (a cell) 1 of a solid electrolyte fuel cell, as compared with a conventional example, a ceramic fiber-made felt body 4 is interposed and inserted between a cell 6 of the fuel cell and a separator 8. Ceramic fiber-made felt 41 manufactured by using zirconia ceramic fiber 42 is adopted as the felt body 4, and a lanthanum manganite layer 43 by baking lanthanum manganite powder is formed around the zirconia ceramic fiber 42, and the ceramic fiber-made felt 41 becomes an aggregate, and holds a shape of the porous felt body 4, and electric conductivity is obtained as a bulk body by the lanthanum manganite layer 43.