To provide a data imprinting device where an expensive film encoder for deciding imprinting timing is disused and the degree of freedom concerning an imprinting position is increased, and which can be used without restricting the imprinting of desired data and the range thereof.

The device 10 imprinting the data on the surface of film by a light emitting element while the film travels is provided with a film winding mechanism 34 including a motor for feeding, a feeding control means 11 winding the film by one frame by controlling a feeding mechanism after finishing exposing operation, a pulse signal output means 35 outputting a pulse signal with the rotation of the motor, a perforation detection part 60 detecting perforation and outputting a perforation signal, a perforation counter counting the number of the pulse signals until the 2nd perforation signal is outputted continuously after the 1st perforation signal is outputted, and a decision means deciding the light emitting interval of imprinting operation this time based on a counted value at the time of winding the film by one frame previous time.