A sulky for use with a self propelled lawn mower includes a mounting bracket having a pair of opposed upstanding mounting ears, a pivot arm that is pivotably connected to the mounting bracket, and a standing platform that is connected to the pivot arm for supporting an operator when the lawn mower is operated. A variety of connecting structures are shown between the mounting bracket, the pivot arm, and the standing platform that accommodate movement of the standing platform relative to the lawn mower, such as would occur when the lawn mower is operated over laterally uneven terrain.