A voltage detection circuit includes a voltage detection unit suitable for comparing a voltage level of a reference voltage terminal with a voltage level of an internal voltage terminal and for generating a detection signal based on a comparison result, a test reference voltage generating unit suitable for receiving an external reference voltage through a pad and for supplying a test reference voltage, which is generated by using the received external reference voltage, to the reference voltage terminal by using a first input resistance, during a test operation, and a normal reference voltage generating unit having a current mirror structure, wherein the normal reference voltage generating unit is suitable for supplying a current, corresponding to an internal reference voltage, to the reference voltage terminal by using a second input resistance different from the first input resistance, during a normal operation.