A charge pump circuit may include: input units suitable for receiving a first input pulse signals and outputting second input pulse signals that are out of phase; an internal voltage generation unit suitable for generating an internal voltage by performing a voltage pumping operation in response to an external voltage and the second input pulse signals, and adjusting a well bias voltage at a power-up period and a normal operation period after the power-up period, in response to a switching control signal; and a switching control signal generation unit suitable for generating the switching control signal which is activated differently on the power-up period and the normal operation period.