To provide a film unit with lens in which magnetic data presenting whether or not a specific print processing is to be performed can be easily recorded at a low cost without using a motor-driven film feeding or complicated magnetic head feeding mechanism.

A film unit 2 with lens packaged beforehand with a photograph film 23 recording the magnetic data for each frame is provided with an electromagnet 41 for erasing the magnetic data, a switching knob 9 for switching whether or not the magnetic data are to be erased, an automatic wind device utilizing the elastic energy of a coil spring 70 and a wind switch 36 to be operated while being linked with the automatic wind device and when the switch knob 9 is positioned for erasing the magnetic data and the wind switch 36 is turned on in the middle of feeding of the film 23 by the automatic wind device, the electromagnet 41 is electrified. When the film is continuously wound for one frame by the automatic wind device without being stopped in the middle, the magnetic data are erased.