There is provided a projection instruction device which generates a projection image to be projected on a parcel based on an image including the parcel and parcel identification information specifying the parcel in the image, the device including: a processor; and a memory, in which by cooperating with the memory, the processor determines a specific area in which the parcel is picked up based on the parcel identification information, and in a case where the parcel is present in the specific area, the processor projects the projection image.