A folding bicycle includes: a front body having a front frame and a front wheel pivotally coupled to the front frame; a rear body having a rear frame axially coupled to and freely separable from the front frame and a rear wheel pivotally coupled to the rear frame; a folding mechanism provided between the front frame and the rear frame and configured for connection thereof; and a fastening mechanism for fastening the folding mechanism to at least one of the front frame and the rear frame so as for the front frame and the rear frame to be coupled together axially, firmly, and integrally, and allowing the folding mechanism to be received in at least one of the front frame and the rear frame.