POWER STORAGE DEVICE WITH GROOVED STRUCTURE TO SUPPRESS ELECTRICAL CONNECTION FAILURE UPON IMPACT

A power storage device (1) includes: a first power storage stack (11) including a first power storage cell (101); a second power storage stack (12) including a second power storage cell (102); a third power storage stack (13) including a third power storage cell (103); and a wiring panel (50) disposed below the first power storage stack (11), the second power storage stack (12), and the third power storage stack (13). The wiring panel (50) includes an insulator plate (51), and a first busbar module (511), a second busbar module (512), and a third busbar module (513), which are disposed on the insulator plate (51). The insulator plate (51) has a first bending starting point (j1) located between the first busbar module (511) and the second busbar module (512), and a second bending starting point (k1) located between the second busbar module (512) and the third busbar module (513).