1. A neuron learning type integrated circuit device, comprising: a plurality of neuron cell units, each of the plurality of neuron cell units including a plurality of synapse circuit units, and a soma circuit unit connected to the plurality of synapse circuit units, each of the plurality of synapse circuit units including a first transistor including a first terminal, a second terminal, and a first control terminal, the first terminal being connected to one of a plurality of voltage lines, the first transistor being normally-on, a second transistor including a third terminal, a fourth terminal, and a second control terminal, the second terminal being connected to the third terminal, the second transistor being normally-off, a first condenser, one end of the first condenser being connected between the second terminal and the third terminal, and a control line connected to the first control terminal and the second control terminal, the soma circuit unit including a Zener diode including an input terminal and an output terminal, the input terminal being connected to the fourth terminal, and a second condenser, one end of the second condenser being connected between the fourth terminal and the input terminal.