There is provided a wet friction material excellent in heat resistance and durability, high in friction coefficient, small in initial fluctuation of the friction coefficient, excellent in heat spot resistance and superior in physical strength to a wet friction material using a phenol resin as a binder. In the wet friction material composed of a fiber base material, a filler, a friction adjustor, and a binder, the binder is a hardened substance of a hydrolyzed solution of a silane coupling agent represented by the following formula (1) (R1)(R2)nSi(OR3)3−n  (1) in which R1 represents an alkylamino group containing primary amine at a terminal, each of R2 and R3 represents an alkyl group containing 1 to 3 carbon atoms, and n represents an integer of 0 or 1.