<p>This invention provides a porous member that, when used in a field requiring a high level of cleanness, can suppress energy loss in a microwave band and can evenly disperse gas. The porous member is formed of a porous ceramic and has a dielectric loss tangent at a microwave band of not more than 1 × 10<SUP>-3</SUP>. A ceramic member comprising a ceramic sinter comprising this porous member in a part thereof is also provided.</p>
