In order to prevent a failure of an engine control device, a riding lawn mower according to an embodiment includes a traveling vehicle body, a mower device, a driver seat, an engine, and an engine fan. The traveling vehicle body includes traveling wheels. The mower device is for lawn mowing and is connected to the traveling vehicle body. The driver seat is disposed in a front portion of the traveling vehicle body. The engine is disposed in a rear portion of the traveling vehicle body. The engine fan is disposed in front of the engine. The riding lawn mower further includes an engine control device disposed in front of the engine fan and controlling the engine. The engine control device has a flat outer shape, and is erected with a surface having a large area facing a front-rear direction.