The existence of a new type of surface sound wave—pure shear surface sound wave—is predicted for conducting solid materials. This wave arises due to the fact that in these materials the mechanical stress depends not only on the deformation but also on the electron concentration because of electron‐lattice interaction via the deformation potential. The penetration depth of this surface wave is of the order of &lgr;&egr;/&khgr;≫&lgr;, where &lgr; is the wavelength, &egr; is the dielectric constant, and &khgr; is the electromechanical coupling constant for the deformation‐potential interaction