Electrochemical Element, Solid Oxide Fuel Cell, and Methods for Producing the Same

Realized are a high-performance electrochemical element and solid oxide fuel cell in which the contact properties between a dense and highly-gastight electrolyte layer and an electrode layer are improved while the treatment temperature during formation of the electrolyte layer is suppressed to a low temperature, and methods for producing the same. An electrochemical element includes an electrode layer , and an electrolyte layer arranged on the electrode layer , wherein the electrode layer has a plurality of pores that are open on a face thereof in contact with the electrolyte layer , and the pores are filled with fine particles made of the same components as the electrolyte layer