Patent ID: 7187594

Claim:
A semiconductor storage device, comprising one or more first field effect transistors and one or more second field effect transistors that are formed on a single semiconductor chip, wherein: the first field effect transistor includes a well region or a body region, a gate electrode, and first and second diffusion layer regions, and the first field effect transistor varies an amount of a current, flowing from the first diffusion layer region to the second diffusion layer region in applying a voltage to the gate electrode, in accordance with an amount of electric charge retained in the well region or the body region, and the second field effect transistor includes third and fourth diffusion layer regions, a gate electrode, and memory function sections, formed on both side walls of the gate electrode so as to be disposed in a gate length direction, each of which has a charge retaining function, and the second field effect transistor varies an amount of a current, flowing from the third diffusion layer region to the fourth diffusion layer region in applying a voltage to the gate electrode, in accordance with an amount of electric charge retained in the memory function sections.