A challenge to be met by the present invention is to provide a screen printer arranged so as to be able to readily perform both replacement of squeegees and operation for filling a paste feed syringe with paste. A paste feed syringe (14) is configured so as to be able to change its position between a paste feed attitude having an imaginary extension within a vertical plane at an oblique angle such that a nozzle (14a) provided at a lower end of the paste feed syringe comes to a position immediately below squeegees (15) and a storage attitude which is turned from the paste feed attitude through about 90 degrees around an axial line (41). When the paste feed syringe (14) is driven in a horizontal direction orthogonal to a direction of reciprocal movement of a squeegee base (30), a first cam follower (45) serving as a driven member disposed at a position below the axial line (41) of the paste feed syringe (14) is guided by a guide surface (44a) of a guide member (44), whereupon the paste feed syringe (14) is swayed around the axial line (41), to thus assume the storage attitude.