A magnetic resonator, for a timepiece, is disclosed which comprises an oscillator of the tuning-fork type having first and second branches in the form of a U of which at least a first branch supports a first permanent magnet defining a first magnetic field, an escape wheel, designed to be arranged in engagement with a watchwork gear train in order to allow it to be driven by a power source of the timepiece and, situated within range of said first permanent magnet in order to undergo the influence of the first magnetic field. In particular, provision is made for the escape wheel to be free and support at least two permanent magnets, preferably at least four, arranged so that the vibrations of the first branch of the tuning fork, on the one hand, control the rotation speed of the escape wheel and, on the other hand, are sustained periodically by the magnetic interaction between the first permanent magnet of the tuning fork and the permanent magnets of the escape wheel in order to define a free escapement.