A paper supply apparatus provided with a support component, a slit plate and a rotation force transmission component. The support component freely rotatably supports a winding core around which roll paper is wound. The slit plate rotates integrally or interlockingly with the support component, and causes pulses to be generated at a sensor. The rotation force transmission component transmits a rotation force of the support component to the slit plate. At the rotation force transmission component, predetermined free play in a direction of rotation of the slit plate is provided.