The invention relates to a spark plug, in particular a prechamber spark plug, comprising a housing (6), an ignition electrode (4) and a ground electrode (1), wherein the ignition electrode (4) can be subjected to an electrical voltage via a supply line, and wherein the supply line extends at least partially within an insulator (11). The invention is characterized in that at least one discharge region (9) of the housing (6) is made from a material having a thermal conductivity of more than 150 W/m K.