A multipoint spark plug (100) includes side electrodes (12) provided in a pair so as to extend in a lengthwise direction of a tip end portion (11) via a gap, and an intermediate electrode (13) provided in the gap between the pair of side electrodes (12) such that a plurality of ignition gaps (14) are formed in the lengthwise direction of the tip end portion (11). An electrode holding portion (15) is formed from separate parts that hold the side electrodes (12) and the intermediate electrode (13), respectively, so as to insulate the side electrodes (12) and the intermediate electrode (13) from the main body portion (10), and the respective parts thereof project into the combustion chamber (4) from the tip end portion (11).