Energy storage device

An energy storage device comprising:

• a module case in which a plurality of accommodation spaces are formed;
• a plurality of bare cells, each of which is accommodated in one of the accommodation spaces;
• a cover coupled to the module case;
• and
• a coupling part coupling the module case to the cover,
• wherein the module case is in direct contact with the bare cells accommodated in the accommodation spaces to support the bare cells,
• the cover includes:
• a cover main body coupled to the module case to cover the accommodation spaces;
• an outer wall member protruding from a cover facing surface of the cover main body, which faces the module case, in a first direction toward the module case;
• and
• an inner wall member protruding from the cover facing surface in the first direction and disposed to be spaced apart from the outer wall member, and
• the coupling part includes a first coupling member disposed between the outer wall member and the inner wall member to couple the module case to the cover.