Shunt regulator and semiconductor device

The purpose of the present invention is to provide a shunt regulator and a semiconductor device capable of preventing damage to an internal circuit without providing a power supply stabilization capacitor and without increasing power consumption. The present invention is provided with: a differential amplifier for generating a differential voltage indicating the difference between a reference voltage and a divided voltage obtained by dividing an inter-terminal voltage between a first terminal and a second terminal; a first transistor having a drain and a source connected to the first terminal and the second terminal, respectively; a voltage detection unit that generates a detection voltage having a voltage value corresponding to the inter-terminal voltage; and a selection unit that supplies either the differential voltage or the detection voltage to the gate of the first transistor on the basis of the inter-terminal voltage. 本发明的目的在于提供一种能够在不设置电源稳定化电容且不增加消耗电力的情况下防止内部电路的损伤的分路调节器及半导体装置。本发明包括：差动放大器，生成表示将第一端子及第二端子