The invention relates to a regulating member for a wristwatch movement, including: a balance (1) comprising at least one movable magnet (10); a magnetic return member comprising at least one stationary permanent magnet (2) engaging with said movable magnet (10) of the balance, so as to generate a mechanical restoring torque for bringing said balance towards at least one inoperative position; an escapement (5, 6) for transmitting pulses to the balance so as to move said balance (1) away from said inoperative position; at least one yoke (3) made of a ferromagnetic material for concentrating the magnetic flux of at least one said permanent magnet.
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