This grafting device is provided with a plate-shaped grafting member having at least one plant holding part for holding a plant for grafting, on a main surface on one side in the thickness direction thereof. The grafting device is provided with a cutting part and a joining part. The cutting part is configured to cut the stem of a plant for grafting held in at least one plant holding part of the grafting member. The joining part is configured to join together portions of the plant for grafting by joining together at least a portion of the grafting member while the portions of the plant for grafting cut by the cutting part are held by the at least one plant holding part.