A piezoelectric lighter of model R with a safety device includes a casing, a storage, a gas emitting nozzle, a piezoelectric unit, a fixed cover, and a safety device. The safety device comprises a blocking stopper; an ignition cap having a cover, a guiding groove and a guiding aperture; a safety button comprising a button portion, a locking arm, a spring and a guiding retaining shaft that is movably arranged in the guiding aperture to push by the spring force the safety button right to form a locked position that the blocking stopper is located in the traveling way of the locking arm; only if the button portion is pushed left, the locking arm is moved away from the stopper to form an unlocked position that the blocking up is released to ignite the piezoelectric lighter.