The present invention relates to a semiconductor circuit and an amplifier circuit. The present invention provides a technology that is capable of easily expanding the output range of an amplifier circuit and improving the area efficiency of a phase compensation capacitive element. A driver circuit (4) and an amplifier circuit (3) that outputs a control signal (CS) for controlling the driver circuit (4) constitute a feedback loop that includes a plurality of poles. A semiconductor circuit (1) includes a capacitive element (CC) for phase compensation in the feedback loop. The amplifier circuit (3) includes an output branch that includes a transistor having a first current terminal from which the control signal is output and a second current terminal connected to a power supply potential, and a branch that is connected in parallel to the output branch and includes a cascode circuit. The capacitive element (CC) that obtains the Miller effect is connected between the driver circuit (4) and two current terminals that are connected to each other and respectively included in two transistors which are included in the cascode circuit.