A bra fastener, comprising a first part (10) and a second part (20). The first part comprises a first connecting band (11) and a plurality of first fastening pieces (12) which are disposed at intervals at the interior of the first connecting band (11) along the length direction of the first connecting band (11), and one surface of the first connecting band (11) is provided with a through hole (111) at a position corresponding to each first fastening piece (12). The second part (20) comprises a second connecting band (21) and a second fastening piece (22) disposed at the interior of the second connecting band (21). The second fastening piece (22) partially extends from one surface of the second connecting band (21) and may pass through one of the through holes (111) on the first connecting band (11) so as to be buckled to a first fastening piece (12) corresponding to the through hole (111). When the second fastening piece (22) is partially buckled to the first fastening piece (12), the second connecting band (21) covers the first connecting band (11).