Provided is an energy storage apparatus includes: at least one energy storage device; and a spacer disposed adjacently to the energy storage device, the spacer being configured to form a ventilation passage which allows cooling air to pass therethrough between the spacer and the energy storage device, wherein the spacer has an opposedly facing portion which opposedly faces a spacer disposed adjacently to the spacer with the energy storage device sandwiched therebetween at a position which faces the ventilation passage and is disposed adjacently to the energy storage device in a flow direction of the cooling air in the ventilation passage, one opposedly facing portion of a pair of opposedly facing portions which opposedly faces each other of the spacers disposed on both sides of the energy storage device has an extending portion extending toward the other opposedly facing portion of the pair of opposedly facing portions, and the extending portion is brought into contact with the other opposedly facing portion.