Provided is a connection structure for connecting electrodes of a plurality of capacitors, including: a circuit board that includes power source patterns and through holes into which the electrodes are inserted, the circuit board being placed on the capacitors; bolts that include shaft portions that are inserted into the through holes and are screwed into the electrodes of the capacitors and head portions that are formed integrally with the shaft portions and press the power source patterns to the electrodes via the circuit board, and spacer portions that are arranged in the through holes and support the bolts.