<p>An ozonizer (100) comprises laminated layers of electrode modulus (102) with flat plate electrodes (7, 3) and a flat dielectric plate (5) with spacer for forming a discharge region between the electrodes. An alternating current is applied between the discharge and a discharge is brought about in a gap of the discharge region, which is injected with a gas containing at least oxygen. In first electrode ozone passage (8) for taking out ozone generated by the discharge region is formed between an electrode surface facing the discharge region and a side portion. Ozone gas retrieving holes are dispersed in discharge region of one electrode to make flow velocity distribution in a radial direction (5). The ozone gas passages collect and draw out ozone generated at discharge region locations inside the electrode.</p>
