Abstract: A vehicular rotation speed sensing apparatus contains a base, a spindle pivoted inside the base, whose one end is mounted to a magnetic force device axially. The vehicular rotation speed sensing apparatus further includes a magnetic force sensor mounted along the axial direction of the spindle and fastened on the base, so as to sense the variation of the magnetic field lines of the magnetic force device. The magnetic force device is located between the spindle and the magnetic force sensor and the spindle rotates in the spindle hole by inserting the spindle in the spindle hole on the wheel base of motorcycle.