A printer system includes a main printer which has a first tank and a first head, a sub printer which has a second tank having a volume smaller than the first tank and a second head and which is provided detachably with respect to the main printer, and a supply mechanism which supplies the ink from the first tank to the second tank when the sub printer is installed to the main printer. Accordingly, it is possible to provide the printer system, which is not provided with any exclusive station that finds no way of use except for the ink supplement and requires any excessive installation space, while the sub printer is of the ink supplement type.