A riding-type mower comprising: a traveling vehicle body having a driver's seat; a rollover protection structure mounted at a rear portion of the traveling vehicle body; a mower unit mounted on the traveling vehicle body; a grass collecting container supported by the traveling vehicle body at a rear portion thereof and configured to store grass clippings cut by the mower unit; the grass collecting container being supported by the traveling vehicle body to be switchably and pivotally elevated/lowered between an elevated discharging posture realized when the container is pivotally elevated about a pivot axis disposed upwardly of the grass collecting container and extending along a lateral width direction of the traveling vehicle body, and a lowered storing posture realized when the container is pivotally lowered about the pivot axis; and the rollover protection structure including a pair of right and left base end side rollover protection structure portions protruding upwards from the traveling vehicle body, and a leading end side rollover protection structure portion which is supported to the leading end portions of the pair of right and left base end side rollover protection structure portions to be pivotally raised/collapsed, and is switchable between a use posture in which the leading end side rollover protection structure portion is raised relative to the base end side rollover protection structure portions and a storage posture in which the leading end side rollover protection structure portion is collapsed to the rear side of the traveling vehicle body relative to the base end side rollover protection structure portions; wherein the leading end side rollover protection structure portion includes a pair of right and left strut portions having base end portions supported at the leading end portions of the pair of right and left base end side rollover protection structure portions, and a beam portion connected to leading ends of the pair of right and left strut portions; characterized in that a distance between the pair of right and left strut portions is greater than a lateral width of the grass collecting container; and wherein a free end side of the grass collecting container enters a space between the pair of right and left strut portions when the leading end side rollover protection structure portion assumes the storage posture and also the grass collecting container assumes the elevated discharging posture. a traveling vehicle body having a driver's seat; a rollover protection structure mounted at a rear portion of the traveling vehicle body; a mower unit mounted on the traveling vehicle body; a grass collecting container supported by the traveling vehicle body at a rear portion thereof and configured to store grass clippings cut by the mower unit; the grass collecting container being supported by the traveling vehicle body to be switchably and pivotally elevated/lowered between an elevated discharging posture realized when the container is pivotally elevated about a pivot axis disposed upwardly of the grass collecting container and extending along a lateral width direction of the traveling vehicle body, and a lowered storing posture realized when the container is pivotally lowered about the pivot axis; and the rollover protection structure including a pair of right and left base end side rollover protection structure portions protruding upwards from the traveling vehicle body, and a leading end side rollover protection structure portion which is supported to the leading end portions of the pair of right and left base end side rollover protection structure portions to be pivotally raised/collapsed, and is switchable between a use posture in which the leading end side rollover protection structure portion is raised relative to the base end side rollover protection structure portions and a storage posture in which the leading end side rollover protection structure portion is collapsed to the rear side of the traveling vehicle body relative to the base end side rollover protection structure portions; wherein the leading end side rollover protection structure portion includes a pair of right and left strut portions having base end portions supported at the leading end portions of the pair of right and left base end side rollover protection structure portions, and a beam portion connected to leading ends of the pair of right and left strut portions; characterized in that a distance between the pair of right and left strut portions is greater than a lateral width of the grass collecting container; and wherein a free end side of the grass collecting container enters a space between the pair of right and left strut portions when the leading end side rollover protection structure portion assumes the storage posture and also the grass collecting container assumes the elevated discharging posture.