An electric storage device comprising: a plurality of battery packs configured to be capable of supplying electricity to a predetermined load, and installed to align in an up-down direction inside a columnar member; a control device configured to be arranged above the battery packs and configured to control the battery packs; a submersion sensor configured to be provided in each of the plurality of battery packs; and a notification unit configured to give notification of information regarding immersion to the outside, the electric storage device being characterized in that the control device includes: a communication unit configured to receive information indicating submersion from the submersion sensor in each battery pack, a determination unit configured to determine a degree of immersion on a basis of which of the submersion sensors having transmitted the received information indicating submersion, and a control unit configured to control the notification unit to give notification of immersion degree information indicating the degree of immersion determined by the determination unit to the outside, wherein the predetermined load is an illumination device used for a streetlight and the notification unit is formed of the illumination device provided on an outer surface of the columnar member. a plurality of battery packs configured to be capable of supplying electricity to a predetermined load, and installed to align in an up-down direction inside a columnar member; a control device configured to be arranged above the battery packs and configured to control the battery packs; a submersion sensor configured to be provided in each of the plurality of battery packs; and a notification unit configured to give notification of information regarding immersion to the outside, the electric storage device being characterized in that the control device includes: a communication unit configured to receive information indicating submersion from the submersion sensor in each battery pack, a determination unit configured to determine a degree of immersion on a basis of which of the submersion sensors having transmitted the received information indicating submersion, and a control unit configured to control the notification unit to give notification of immersion degree information indicating the degree of immersion determined by the determination unit to the outside, wherein the predetermined load is an illumination device used for a streetlight and the notification unit is formed of the illumination device provided on an outer surface of the columnar member. a communication unit configured to receive information indicating submersion from the submersion sensor in each battery pack, a determination unit configured to determine a degree of immersion on a basis of which of the submersion sensors having transmitted the received information indicating submersion, and a control unit configured to control the notification unit to give notification of immersion degree information indicating the degree of immersion determined by the determination unit to the outside, wherein the predetermined load is an illumination device used for a streetlight and the notification unit is formed of the illumination device provided on an outer surface of the columnar member.