An input protection circuit (10, 20, and 30) comprising: a first transistor of a field-effect type coupled in series between an input terminal and an electronic circuit, the input terminal receiving an input voltage, the electronic circuit receiving an input voltage (Vin), the first transistor switching to an off-state in a case where the input voltage is higher than a positive power supply voltage of the electronic circuit; a second transistor of a field-effect type coupled in series between the first transistor and the electronic circuit, the second transistor switching to an off-state in a case where the input voltage is lower than the negative power supply voltage of the electronic circuit; and a voltage control circuit (11, 24, and 34) configured to maintain gate-source voltages of the first transistor and the second transistor as voltages within a power supply voltage range of the electronic circuit based on the input voltage, wherein the first transistor is an N-type field-effect transistor, the first transistor having a drain coupled to the input terminal, wherein the first transistor has a source coupled to a drain of the second transistor, and wherein the second transistor is a P-type field-effect transistor, the second transistor having a source coupled to the electronic circuit, wherein the input protection circuit further comprises: a first diode coupled between a gate and a source of the first transistor; and a second diode coupled between a gate and a source of the second transistor, characterized in that- the voltage control circuit includes: a first voltage buffer for monitoring the input voltage; a first level-shift circuit configured to output a sum of the input voltage and a predetermined voltage (Vs) to the gate of the first transistor; and a second level-shift circuit configured to input a difference between the input voltage and a predetermined voltage to the gate of the second transistor, wherein the predetermined voltage is lower than the positive power supply voltage of the electronic circuit and higher than the negative power supply voltage of the electronic circuit. a first transistor of a field-effect type coupled in series between an input terminal and an electronic circuit, the input terminal receiving an input voltage, the electronic circuit receiving an input voltage (Vin), the first transistor switching to an off-state in a case where the input voltage is higher than a positive power supply voltage of the electronic circuit; a second transistor of a field-effect type coupled in series between the first transistor and the electronic circuit, the second transistor switching to an off-state in a case where the input voltage is lower than the negative power supply voltage of the electronic circuit; and a voltage control circuit (11, 24, and 34) configured to maintain gate-source voltages of the first transistor and the second transistor as voltages within a power supply voltage range of the electronic circuit based on the input voltage, wherein the first transistor is an N-type field-effect transistor, the first transistor having a drain coupled to the input terminal, wherein the first transistor has a source coupled to a drain of the second transistor, and wherein the second transistor is a P-type field-effect transistor, the second transistor having a source coupled to the electronic circuit, wherein the input protection circuit further comprises: a first diode coupled between a gate and a source of the first transistor; and a second diode coupled between a gate and a source of the second transistor, characterized in that- the voltage control circuit includes: a first voltage buffer for monitoring the input voltage; a first level-shift circuit configured to output a sum of the input voltage and a predetermined voltage (Vs) to the gate of the first transistor; and a second level-shift circuit configured to input a difference between the input voltage and a predetermined voltage to the gate of the second transistor, wherein the predetermined voltage is lower than the positive power supply voltage of the electronic circuit and higher than the negative power supply voltage of the electronic circuit. a first diode coupled between a gate and a source of the first transistor; and a second diode coupled between a gate and a source of the second transistor, characterized in that- the voltage control circuit includes: a first voltage buffer for monitoring the input voltage; a first level-shift circuit configured to output a sum of the input voltage and a predetermined voltage (Vs) to the gate of the first transistor; and a second level-shift circuit configured to input a difference between the input voltage and a predetermined voltage to the gate of the second transistor, wherein the predetermined voltage is lower than the positive power supply voltage of the electronic circuit and higher than the negative power supply voltage of the electronic circuit. a first voltage buffer for monitoring the input voltage; a first level-shift circuit configured to output a sum of the input voltage and a predetermined voltage (Vs) to the gate of the first transistor; and a second level-shift circuit configured to input a difference between the input voltage and a predetermined voltage to the gate of the second transistor, wherein the predetermined voltage is lower than the positive power supply voltage of the electronic circuit and higher than the negative power supply voltage of the electronic circuit.