A piezoelectric ignition device for spark-igniting a fuel of such burning instruments as cigaret lighters, gas ranges and the like, utilizing a high electric voltage obtained by giving a bending stress in lengthwise direction to an elongated rectangular plate-shaped porcelain piezoelectric element. A plurality of electrodes is formed at least on one of the surfaces of the plate-shaped element along the respective lines parallel to lengthwise both ends and dividing the element lengthwise into "n" divisions, and adjacent divisions are polarized reversely to each other also in the lengthwise direction. A force-to-electricity conversion is made with a piezoelectric constant g.sub.33.