A data management device comprising: a data management section configured to acquire data acquired by a board work machine that performs a predetermined board work with respect to a board, the acquired data being related to the board work with at least one additional information regarding the board work being provided, by the data management section, to the data acquired by the board work machine, the data management section storing the acquired data in a storage device to which a maximum storage amount is set for each additional information, wherein the additional information comprises work information that is information related to a work result of the board work, wherein the data acquired by the board work machine comprises at least one of image data and log data; a priority setting section configured to set a storage priority that is a priority of continuing storage of the acquired data stored in the storage device, wherein the data management section stores the acquired data in the storage device, and, in a case in which the maximum storage amount for at least one of the additional information is exceeded, deletes the acquired data stored in the storage device in order from the acquired data having a low storage priority set by the priority setting section; and a quality determination section configured to determine a quality of the board work based on the acquired data, wherein when the quality determination section determines that the work result of the board work is good, the acquired data is defined as good acquired data, and when the quality determination section determines that the work result of the board work is bad, the acquired data is defined as bad acquired data, wherein the priority setting section is configured to raise the storage priority of the bad acquired data as compared with the storage priority of the good acquired data, wherein the priority setting section is configured to raise the storage priority of related good acquired data, that is the good acquired data related to the bad acquired data, as compared with the storage priority of the good acquired data other than the related good acquired data, wherein a predetermined number of pieces of good acquired data acquired before and after the point in time when the bad acquired data is acquired is related to the bad acquired data, and is acquired data for which it is highly likely that at least one of a device used in the board work, a work condition of the board work, a type of an article added to the board in the board work, a manufacturer of the article, and a manufacturing lot of the article is the same. a data management section configured to acquire data acquired by a board work machine that performs a predetermined board work with respect to a board, the acquired data being related to the board work with at least one additional information regarding the board work being provided, by the data management section, to the data acquired by the board work machine, the data management section storing the acquired data in a storage device to which a maximum storage amount is set for each additional information, wherein the additional information comprises work information that is information related to a work result of the board work, wherein the data acquired by the board work machine comprises at least one of image data and log data; a priority setting section configured to set a storage priority that is a priority of continuing storage of the acquired data stored in the storage device, wherein the data management section stores the acquired data in the storage device, and, in a case in which the maximum storage amount for at least one of the additional information is exceeded, deletes the acquired data stored in the storage device in order from the acquired data having a low storage priority set by the priority setting section; and a quality determination section configured to determine a quality of the board work based on the acquired data, wherein when the quality determination section determines that the work result of the board work is good, the acquired data is defined as good acquired data, and when the quality determination section determines that the work result of the board work is bad, the acquired data is defined as bad acquired data, wherein the priority setting section is configured to raise the storage priority of the bad acquired data as compared with the storage priority of the good acquired data, wherein the priority setting section is configured to raise the storage priority of related good acquired data, that is the good acquired data related to the bad acquired data, as compared with the storage priority of the good acquired data other than the related good acquired data, wherein a predetermined number of pieces of good acquired data acquired before and after the point in time when the bad acquired data is acquired is related to the bad acquired data, and is acquired data for which it is highly likely that at least one of a device used in the board work, a work condition of the board work, a type of an article added to the board in the board work, a manufacturer of the article, and a manufacturing lot of the article is the same.