A plate inserting apparatus includes a plate cylinder, press roller, and braking unit. A plate is to be mounted on the outer surface of the plate cylinder. The press roller is rotatably supported to oppose the outer surface of the plate cylinder, and inserts the leading edge bent portion of the plate, supplied to the plate cylinder upon rotation of the plate cylinder, into a groove portion formed in the outer surface of the plate cylinder. The braking unit is arranged in a plate storing portion for storing the plate supplied to the plate cylinder, and brakes the plate with the leading edge bent portion inserted in the groove portion of the plate cylinder.