SOLID ELECTROLYTE ASSEMBLY AND ELECTROCHEMICAL ELEMENT COMPRISING SAME

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This solid electrolyte assembly (10) is obtained by sequentially superposing, on one surface of a substrate (11), a first electrode layer (12) and a solid electrolyte layer (13) in this order. The first electrode layer (12) contains platinum or the like, and a metal oxide that has ion conductivity. The substrate (11) has a plurality of through holes (hole parts (14)) which extend in a direction that intersects with the surface facing the first electrode layer (12). It is preferable that the metal oxide has oxide ion conductivity. It is also preferable that the metal oxide contains one or more rare earth elements.