In an engine igniter 1, when a spark-discharge duration time Tc calculated on the basis of operation conditions of an internal combustion engine has elapsed after generation of spark discharge by an ignition coil 13, an electricity-supply resumption circuit 51 is operated in order to resume supply of primary current i1 to a primary winding L1, to thereby interrupt the spark discharge. In order to reduce installation operations on the finished sliding board, the interface element has been connected positively andor frictionally andor in another mechanical manner to the core during the building of the sliding board by means of at least one of the anchoring elements. The stopper film is made of an SiCN film having a low optical reflectance, thereby causing it to serve as an antireflective film when the photoresist film is exposed. A biometric device is coupled to the computer system.