Method of manufacturing power storage module

A method of manufacturing a power storage module, the method comprising:

• stacking a plurality of power storage cells along a first direction;
• compressing the plurality of power storage cells along the first direction;
• aligning the plurality of power storage cells in a second direction orthogonal to the first direction after relieving pressing force of the compressing of the plurality of power storage cells along the first direction;
• compressing the plurality of power storage cells along the first direction after aligning the plurality of power storage cells in the second direction;
• disposing a restraint portion on both sides in the first direction with respect to the plurality of power storage cells under application of pressing force of the compressing of the plurality of power storage cells along the first direction after aligning the plurality of power storage cells in the second direction;
• and
• restraining the plurality of power storage cells by the restraint portion along the first direction by relieving, after disposing the restraint portion, the pressing force of the compressing of the plurality of power storage cells along the first direction after aligning the plurality of power storage cells in the second direction.