Substrate work system

A substrate work system including a work device configured to perform predetermined work on a substrate by use of an exchangeable work unit, the substrate work system comprising:

• a storage section configured to store the work unit;
• a maintenance device configured to perform maintenance of the work unit;
• a conveyance device capable of conveying the work unit;
• a determination section configured to determine a maintenance time for the work unit used in the work device based on quality information on work quality of the predetermined work;
• and
• a control section configured to, when the determination section determines that a maintenance time arrives, cause the conveyance device, the work device, and the maintenance device to unload the work unit for exchange from the storage section, convey the work unit to the work device, for being exchanged with the work unit that has been used up in the work device, and convey the used-up work unit so exchanged to the maintenance device so as to be maintained thereby.