Abstract: A closing cap for a bottle (2) includes a collar (4) intended to be mounted on the neck (20) of the bottle; a closing hood (60) provided with a top (76) and with a cylindrical side wall (64) capable of being positioned round the collar (4); a rigid shackle (8) having two ends (12a, 14a) connected by a central portion (10), the ends being mounted on the collar for pivoting round an axis (B) so that, by pivoting, the central portion of the shackle (8) comes to bear against the top of the hood; and an elastic part (72) capable of permitting an axial displacement of the top of the hood relative to the shackle (8) and of ensuring the permanent bearing of the top (76) against the shackle (8). The elastic part may be by at least one zone (72) of the elastically deformable hood unitary with the hood (60).