A recoil damping device for portable firearms, including a damping means inserted in the casing; a movable insert is functionally associated with the damping means and slide along a direction that is substantially axial with respect to the casing; the damping means is constituted by a body formed by a cellular solid having a stochastic structure, such as a foam, or having a nonstochastic structure, such as a reticular structure, lattice, etc.