A self-cleaning member comprising a member having a porous surface is disclosed. The member has a contact angle hysteresis Δθ (=θa−θr), which is a difference between an advancing contact angle θa and a receding contact angle θr measured by a dynamic contact angle measurement with an extension/contraction method, of 80 degree or more at the surface layer and a receding contact angle θr of 25 degree or less, is capable of forming a water film on the surface by water provided and of allowing an ionic or reactive contaminant to be washed away without fixation.