An adjustment jig for performing position alignment of nozzle holders, including: multiple positioning pins including a primary insertion section configured such that multiple nozzle holders of a primary side device are insertable into the primary insertion section and a secondary insertion section configured such that multiple nozzle holders of a secondary side device are insertable into the secondary insertion section; and a board member configured such that the multiple positioning pins protruding to an opposite side to the primary insertion section and the secondary insertion section can be attached at a specified fixing position via a fixing section, a position of which is adjustable.