A storage device is used in a printing device that includes a printing section configured to perform a viscous fluid printing process on a printing target using an exchange target object including a screen mask. The storage device includes a storage section having a transfer stage for loading and unloading the exchange target object to and from the printing section, the storage section being configured to accommodate multiple placement sections, each for placing the exchange target object, and to store the exchange target object, a placement section moving section configured to move any one of the placement sections to the transfer stage, and a target object moving section disposed on the transfer stage, the target object moving section being configured to move between a retracted position allowing the placement section to pass and an abutting position abutting against the exchange target object on the placement section and to move the exchange target object in a loading/unloading direction while abutting against the exchange target object at the abutting position.