A semiconductor device by which a circuit having the same functions as those of the conventional circuits is realized with a very small number of elements, and complex logical functions can be designed simply, and further, its layout is also possible. A semiconductor device made up of at least one neuron MOS transistor having a gate electrode provided in a potentially floating state in a portion for isolating a source and drain region via a first insulation film, and plural control electrodes which are capacitively coupled to the floating gate electrode via a second insulation film, is characterized in that the first signal is inputted to a first control gate elctrode of the first neuron MOS transistor, the first signal is inputted to a first inverter comprising one or more stages, and the output of the first inverter is inputted to a second control gate electrode which is one of the plural control gate electrodes other than the first control gate electrode.