A manufacturing method of a power storage module (1) includes a stacking process of stacking a plurality of bipolar electrodes (100), a positive terminal electrode (200), and a negative terminal electrode (300), a sealing process of forming a sealing member (20) that seals a space (R) on a peripheral edge portion of each electrode (100, 200, 300) in an electrode laminate (10) such that sealing member (20) is formed while holding a liquid injection member (30), an insulation inspection process of inspecting an insulation state between a positive electrode uncoated portion (112b) and a negative electrode uncoated portion (113b), by applying a voltage to electrode laminate (10) in a state where the inside of sealing member (20) is depressurized from liquid injection member (30), a liquid injection process of supplying an electrolyte solution from liquid injection member (30) into sealing member (20) after the insulation inspection process, and a charging process of charging electrode laminate (10).