An electrochemical cell including at least one dense solid electrolyte body (3A), at least two dense interconnectors (2A) for collecting current passing the cell, cathodes (4A) and anodes (5A). The dense solid electrolyte body or bodies (3A) and the dense interconnectors (2A) constitute a structural body in which a plurality of first gas flow channels (6A) and a plurality of second gas flow channels (7A) both extend in a given direction and are each defined and surrounded by a part of one solid electrolyte body (3A) and a part of one interconnector (2A). The anodes (5A) are formed on respective walls of the solid electrolyte body or bodies and the interconnectors defining the respective first gas flow channels, while the cathodes (4A) are formed on respective walls defining the respective second gas flow channels. Every anode is opposed to an adjacent cathode or adjacent cathodes via a solid electrolyte body (3A), and every cathode is opposed to an adjacent anode or adjacent anodes via a solid electrolyte body (3A).