A printing press comprising: an impression cylinder (48, 49) which holds and transports a sheet; a blanket cylinder which is in contact with the impression cylinder (48, 49) and on which a first blanket is mounted; a collecting plate cylinder which is in contact with the blanket cylinder and on which a first plate is mounted; a collecting blanket cylinder which is in contact with the collecting plate cylinder and on which a second blanket is mounted; a plurality of partial plate cylinders which are in contact with the collecting blanket cylinder and on which a plurality of second plates are mounted, respectively; a plurality of inking devices which correspond to the plurality of partial plate cylinders and supply ink to the plurality of partial plate cylinders, respectively; and a dampening unit which supplies dampening water to the collecting plate cylinder, characterized in that the dampening unit includes: a form roller which supplies the dampening water to the collecting plate cylinder by contact with the collecting plate cylinder; and a switching mechanism which switches between printing in a state in which the dampening water is supplied to the collecting plate cylinder, and printing in a state in which the dampening water is not supplied to the collecting plate cylinder, by bringing the form roller into contact with the collecting plate cylinder and separating the form roller from the collecting plate cylinder, the switching mechanism being configured to bring the form roller into contact with the collecting plate cylinder when a lithographic printing plate is mounted as the first plate on the collecting plate cylinder, and to separate the form roller from the collecting plate cylinder when one of a relief printing plate and a waterless lithographic printing plate is mounted as the first plate on the collecting plate cylinder. an impression cylinder (48, 49) which holds and transports a sheet; a blanket cylinder which is in contact with the impression cylinder (48, 49) and on which a first blanket is mounted; a collecting plate cylinder which is in contact with the blanket cylinder and on which a first plate is mounted; a collecting blanket cylinder which is in contact with the collecting plate cylinder and on which a second blanket is mounted; a plurality of partial plate cylinders which are in contact with the collecting blanket cylinder and on which a plurality of second plates are mounted, respectively; a plurality of inking devices which correspond to the plurality of partial plate cylinders and supply ink to the plurality of partial plate cylinders, respectively; and a dampening unit which supplies dampening water to the collecting plate cylinder, a form roller which supplies the dampening water to the collecting plate cylinder by contact with the collecting plate cylinder; and a switching mechanism which switches between printing in a state in which the dampening water is supplied to the collecting plate cylinder, and printing in a state in which the dampening water is not supplied to the collecting plate cylinder, by bringing the form roller into contact with the collecting plate cylinder and separating the form roller from the collecting plate cylinder, the switching mechanism being configured to bring the form roller into contact with the collecting plate cylinder when a lithographic printing plate is mounted as the first plate on the collecting plate cylinder, and to separate the form roller from the collecting plate cylinder when one of a relief printing plate and a waterless lithographic printing plate is mounted as the first plate on the collecting plate cylinder.