Electricity storage device

An electricity storage device comprising:

• a plurality of cells that are aligned in a predetermined direction;
• a pair of end plates that sandwich the plurality of cells in the predetermined direction;
• and
• a restraining member that extends in the predetermined direction, is fixed to the pair of end plates, and exerts a restraining force on the plurality of cells in the predetermined direction via the end plates,
• wherein each of the end plates includes a first plate and a second plate, the first plate having a plurality of ribs on a surface that faces the adjacent cell and being formed of insulating material, the second plate being fixed to the first plate on a side opposite to the surface that faces the adjacent cell and being formed of material stronger than the insulating material for the first plate, and
• the ribs for a closed space on a surface of the cell that is adjacent to the first plate.