JRC has developed many kinds of surface acoustic wave (SAW) devices for about thirty years, such as IF filters for wireless communications, RF filters for portable devices, RF filters for automotive applications and SAW oscillators for optical communications. For IF filters for wireless communications, some design techniques for slanted finger SAW filters have been developed in order to achieve desired amplitude and phase responses in the pass band. For RF filters for portable devices, flip-chip assembly techniques for SAW devices have been developed in order to reduce the size. The flipchip SAW filters have achieved a size reduction of portable phones. Furthermore, flip-chip SAW filters for automotives have been released. For the module applications, GHz-band surface transverse wave (STW) based oscillators for optical communications have been developed. Recently, SAW biosensors and SAW liquid-phase sensors have been developing for future new applications, such as medical, environmental and foods.