The invention relates to a fuel injector (10), having an electrical actuator (28), particularly an electromagnet, for injecting fuel into the combustion chamber of an internal combustion engine. A closing element (44), which releases or closes an outlet (62) of a control chamber (60) can be operated by the actuator (28). An armature (20) operating the closing element (44) has openings (58, 94, 104) which are opened when the closing element (44) is closing and closed when the closing element (44) is opening.