A convoy of vehicles, including a black sedan carrying Park, entered a detention facility near Seoul after the Seoul Central District Court granted prosecutors' request to arrest her.
Many Park supporters waved national flags and shouted "president" as Park's car entered the facility.
Prosecutors can detain her for up to 20 days before formally charging her, meaning she will likely be in jail while her case is heard. A district court normally issues a ruling within six months of an indictment.