A photosensitive tabular member suction mechanism that can reliably suck with a simple configuration, on a stage, photosensitive tabular members of different sizes by effectively using the suction force resulting from negative pressure, and an image recording device disposed with this photosensitive tabular member suction mechanism. Cylinder members are attached inside the stage in correspondence to respective suction holes, and the piston members accommodated in the suction holes are urged upward by springs. In a state where a substrate is not placed on a placement surface of the stage, the piston members are in a closed position due to the urging force of the springs and block off the suction holes. When the substrate is placed on the placement surface, the piston members move to an open position counter to the urging force of the springs and the suction holes are opened, whereby the substrate is sucked by a suction force resulting from negative pressure.