Disclosed is an electricity storage device including a first electrode (a positive electrode (20)), a second electrode (a negative electrode (21)), and a non-aqueous electrolyte solution. The first electrode contains, as an active material, an organic compound having a quinone skeleton. The second electrode has a polarity opposite to that of the first electrode. The non-aqueous electrolyte solution contains a lithium salt and a solvent represented by the following formula (1): R—O(CH2CH2O)n—R′  (1) where R and R′ are each independently a saturated hydrocarbon having 1 to 5 carbon atoms, and n is an integer of 2 to 6.