Electrochemical cell

An electrochemical cell comprising:

• an electrode body in which a first electrode layer and a second electrode layer are alternately stacked in a first direction via a solid electrolyte;
• an exterior packaging body in which a plurality of substrates including a first substrate formed from a ceramic material are stacked in the first direction, and a cavity in which the electrode body is accommodated is formed;
• a first electrode connection wiring that is formed in the exterior packaging body and connects the first electrode layer and an external substrate to each other;
• and
• a second electrode connection wiring that is formed in the exterior packaging body and connects the second electrode layer and the external substrate to each other,
• wherein at least the first electrode connection wiring is formed in the first substrate, and
• an attachment portion, to which a fastening member configured to mount at least the first electrode connection wiring to the external substrate is attached, is formed in the first substrate.