A bicycle pedal with automatic engagement and disengagement includes a body (2) rotatable on a pedal axle (3) with: a front abutment (4) cooperating with a conjugate abutment surface (5) provided on a cleat (6) fixed to the sole of a shoe; a retaining member (9) rotatable about a geometrical axis (A) parallel to that of the pedal, adapted to be pressed against the cleat by a flexing element (B, 15) to attach the cleat to the pedal, one end (15a) of the flexing element being immobilized against the body (2), the other end (15b) being in bearing engagement against the retaining member. The articulation axle of the retaining member (9) includes a rod (13) that extends transversely under the flexing element (B, 15), which is in bearing engagement on said articulation axle, the flexing element functioning in flexion at three points.