For the far-right former army captain, the New Year's Day inauguration was the culmination of a journey from a marginalized and even ridiculed congressman to a leader who many Brazilians hope can combat endemic corruption as well as violence that routinely gives the nation the dubious distinction of being world leader in total homicides.
A fan of U.S. President Donald Trump, the 63-year-old longtime congressman rose to power on an anti-corruption and pro-gun agenda that has energized conservatives and hard-right supporters after four consecutive presidential election wins by the left-leaning Workers' Party.
Bolsonaro was the latest of several far-right leaders around the globe who have come to power by riding waves of anger at the establishment and promising to ditch the status quo.
"Congratulations to President @jairbolsonaro who just made a great inauguration speech," Trump tweeted. "The U.S.A. is with you!"