PROBLEM TO BE SOLVED: To provide a suction platen mechanism capable of bringing open/close states of suction holes into appropriate states corresponding to a width of a recording medium by only closing a closing lid without lifting up the recording medium.SOLUTION: A suction platen mechanism 20 comprises: a platen 21 having a platen surface 21a provided with a plurality of suction hole rows 21c consisting of a plurality of suction holes 21b and being capable of being moved to a predetermined position where transportation of a recording medium is performed in operative association with closing of a closing lid 30; shutter members 22 provided for each of the plurality of suction hole rows 21c; and engagement means 23 not engaging with the shutter members 22, not moving the shutter members 22 and opening the suction hole rows 21c in the case where the recording medium is positioned on the suction hole rows 21c when the platen 21 is positioned at the predetermined position, and engaging with the shutter members 2
