To provide a unit drawing structure requiring a lower cost and preventing the deformation or breakage of a first guide.

The unit drawing structure comprises a unit 53 provided in a device body 51, the first guide 57 provided in the device body 51 for guiding the unit 53 from a position where it is stored in the device body 51 to a position where it is drawn from the device body 51, a caster 55 provided on the unit 53, a second guide 59 provided on the unit 53 for guiding the caster 55 from a position where it abuts on a floor to a position where it is apart therefrom, and a first locking mechanism 61 for prohibiting the caster 55 from being moved to the second guide 59, wherein a second locking mechanism 63 is provided for uncancelling the prohibition of the unit 53 from being moved to the first guide 57 if the caster 55 is not moved to a position where it abuts on the floor when the unit 53 is at the position where it is stored in the device body 51.