Patent ID: 8448942

Claim:
A recording medium stacker that supports and stacks a recording medium discharged from a recording apparatus, the stacker comprising: a first stack member provided with a first support surface capable of supporting the recording medium; and a second stack member that is stored within the first stack member and can be pulled out of and pushed into the first stack member, and that is provided with a second support surface capable of supporting the recording medium when the second stack member has been pulled out of the first stack member and is in use, wherein the second stack member includes, on both side surfaces in the width direction that is the direction that intersects with the pull-out direction from the first stack member and follows the second support surface: base-end projection portions, provided in the side surfaces, that protrude from the base end in the pull-out direction of the second stack member outward in the width direction; and leading-end projection portions, provided further toward the leading end of the second stack member in the pull-out direction than the base-end projection portions, that protrude outward in the width direction at a shorter length than the base-end projection portions, and the first stack member includes: guide rails along which the projection portions slide during the pull-out; contact portions that allow the leading-end projection portions to pass during the pull-out but prevent the passage of the base-end projection portions; and a support portion that supports the leading-end projection portions when the base-end projection portions have made contact with the contact portions.