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特許 権利維持 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<-3>. A ceramic member comprising a ceramic sinter comprising this porous member in a part thereof is also provided.