PURPOSE: To prevent a hand from becoming dirty during a clerical work while a seal remains exposed and ink, etc.. from drying due to a cap left open, etc., by automatically making printed letter forms appear and disappear by the pressing operation of the pressing body of the cap covering an extruding seal being a writing material, extruding lipstick, etc.

CONSTITUTION: The title cap device is composed of a cylindrical outer tube body 1 and an inner tube body 2 internally touching the outer tube body 1; the upper end of the inner tube body 2 has a curved surface extending along the inner peripheral face of the outer tube body 1; a pair of cover pieces 10, 10, in which mutual free edges 4, 4 come freely into contact with each other and the central part 6 of a base edge 5 is connected to the upper edge of the inner tube body 2 and other parts come freely into contact with the upper edge of the inner tube body 2, are provided; the mutual cover pieces are freely energized in facing directions, and the cover pieces are pressed by a pressing body 11 having printed letter forms built in so as to be freely opened from inside.