Abstract: A print head assembly of a printing device, in which a supporting member flexibly supporting a plurality of armature members, and a permanent magnet member urging the armatures in one direction by means of its magnetic force and arranged between a head body as a yoke member, including plurality of cores wound individually with solenoid coils, and a cover member integrally formed with a guide member having a nose for guiding a number of print wires. All these members are joined together along an assembling axis. The cover member has apertures individually formed at positions corresponding to the armature members, the armature members being secured to the supporting member by irradiation of an electron beam or a laser beam from the outside through the apertures.