RIDING LAWN MOWER

Provided is a riding lawn mower capable of stably running while including a grass collection container. [0002] A riding lawn mower (1) includes a running vehicle body (2) having running wheels (31), (32) and a driver's seat (20); a mower device (3) connected to the running vehicle body (2); and a grass collection container (8) provided behind the driver's seat (20) on the running vehicle body (2) and configured to store grass cut by the mower device (3). An engine room (40) is provided below the grass collection container (8), and an engine (4) and an exhaust gas purification device (5) configured to purify exhaust gas from the engine (4) are arranged in parallel in the engine room (40).