An operational amplification circuit includes a differential amplification circuit portion that amplifies a differential input, and an output circuit portion that outputs the amplified output using a signal amplified in the differential amplification circuit portion. The differential amplification circuit portion is provided with a pair of first transistors to which signals are differentially input, and second and third transistors which are connected to current paths of the pair of first transistors and which constitute current mirror circuits with respect to each other. The output circuit portion is provided with a fourth transistor, a gate of which is connected to a drain of the second transistor, and an amplified output is output from a drain of the fourth transistor.