A fluorescent display device capable of minimizing a variation in pitches between lead terminals and deformation thereof and attaining mounting of the device on a circuit board without soldering. The lead terminals each are bent at a distal end thereof so that the distal end is held in each of terminal holding holes of a mounting holder to hold the mounting holder therein, so that the fluorescent display device is mounted on the circuit board while keeping the mounting holder and circuit board fixed to each other through a fixing structure and keeping the lead terminals pressedly contacted with connections on the circuit board.