A lawn mower comprising: a vehicle body having a pair of right and left front wheels and a pair of right and left rear wheels; a mower device provided between the front wheels and the rear wheels and configured to mow grass on a traveling land surface; a grass collecting container provided rearwardly of the vehicle body; a conveyer duct extending between the mower device and the grass collecting container as extending through between the pair of right and left rear wheels and configured to convey grass clippings discharged from the mower device to the grass collecting container; a belt conveyer configured to convey the grass clippings discharged from the mower device toward the grass collecting container, the belt conveyer forming a conveying bottom face of the conveyer duct wherein a conveying terminal end of the belt conveyer enters the inside of the grass collecting container; characterized in that the conveyer duct has a discharge opening which is open toward the rear side of the vehicle body; the grass collecting container is configured to be pivotable between a lowered grass collecting posture and an elevated discharging posture about a pivot axis provided at an upper portion of the grass collecting container and extending in a vehicle body transverse direction, wherein under the lowered grass collecting posture, a grass clippings entrance/exit of the grass collecting container comes in opposition to the discharge opening; and under the elevated discharging posture, the grass clippings entrance/exit goes distant rearwardly and upwardly relative to the discharge opening; wherein the lawn mower further comprises a blocking member disposed upwardly of the conveying terminal end and forming a guide portion therein; and when the grass collecting container is switched to the elevated discharging posture, the blocking member enters the grass clippings entrance/exit so that the guide portion causes grass clippings present inside the grass collecting container to be dropped to more rear side than the belt conveyer and to avoid dropping of the grass clippings discharged from the grass collecting container onto the belt conveyer. a vehicle body having a pair of right and left front wheels and a pair of right and left rear wheels; a mower device provided between the front wheels and the rear wheels and configured to mow grass on a traveling land surface; a grass collecting container provided rearwardly of the vehicle body; a conveyer duct extending between the mower device and the grass collecting container as extending through between the pair of right and left rear wheels and configured to convey grass clippings discharged from the mower device to the grass collecting container; a belt conveyer configured to convey the grass clippings discharged from the mower device toward the grass collecting container, the belt conveyer forming a conveying bottom face of the conveyer duct wherein a conveying terminal end of the belt conveyer enters the inside of the grass collecting container; characterized in that the conveyer duct has a discharge opening which is open toward the rear side of the vehicle body; the grass collecting container is configured to be pivotable between a lowered grass collecting posture and an elevated discharging posture about a pivot axis provided at an upper portion of the grass collecting container and extending in a vehicle body transverse direction, wherein under the lowered grass collecting posture, a grass clippings entrance/exit of the grass collecting container comes in opposition to the discharge opening; and under the elevated discharging posture, the grass clippings entrance/exit goes distant rearwardly and upwardly relative to the discharge opening; wherein the lawn mower further comprises a blocking member disposed upwardly of the conveying terminal end and forming a guide portion therein; and when the grass collecting container is switched to the elevated discharging posture, the blocking member enters the grass clippings entrance/exit so that the guide portion causes grass clippings present inside the grass collecting container to be dropped to more rear side than the belt conveyer and to avoid dropping of the grass clippings discharged from the grass collecting container onto the belt conveyer.