The present invention provides a display device which includes a drive circuit having a CMOS shift register circuit constituted of a simple CMOS circuit. A drive circuit includes a shift register circuit, and the shift register circuit includes n(n≧2) pieces of basic circuits which are connected vertically in multiple stages. The basic circuit includes a first transistor of a first conductive type having a first electrode to which a clock is applied, a second transistor of a second conductive type different from the first conductive type in a conductive type and having a first electrode to which a second power source voltage is applied, and a third transistor of a first conductive type having a second electrode which is connected to the second electrode of the second transistor and a first electrode to which a first power source voltage different from the second power source voltage is applied, wherein the second electrode of the first transistor is connected to a control electrode of the third transistor, an input signal is applied to a control electrode of the first transistor and a control electrode of the second transistor, and a voltage of the second electrode of the third transistor forms a scanning circuit output.