To provide an electrical double layer capacitor having high electrostatic capacity, wherein the deviation in position between a polarizable electrode and a current collector is prevented, and thereby a contact resistance between these two components can be reduced.

This electrical double layer capacitor 1 is provided with at least one set of cell laminates 5, where a separator 3 is interposed in between a pair of polarizable electrodes 2, 2, and a current collector is laminated outside each of the pair of polarizable electrodes 2, 2. In the lamination surface between each of the polarizable electrodes 2, 2 and each of the current collectors 4 outside the polarizable electrode 2, projections 6, each having an acute-angle or circular-arc shape tip of tip angle 90° or smaller, are formed.