Riding lawn mower

A riding lawnmower, comprising:

• left and right wheels as main drive wheels that are each independently driven by an electric rotary machine;
• at least one caster wheel as a steering control wheel;
• a lawnmower blade or a lawnmower reel that is driven for lawn mowing;
• a control section that receives a turn instruction input of a turn operator as an electric signal, and, in response to the turn instruction input by the turn operator, electrically controls, via control of the electric rotary machine, the driving of each of the left and right wheels in accordance with preset standard setting conditions or in accordance with deceleration setting conditions under which at least one of a vehicle movement speed during a turn and a vehicle turning speed is decelerated more than under the standard setting conditions that are different from the standard setting conditions, the vehicle turning speed being a speed of change in speeds of the left and right wheels during a turn;
• and
• a unit that selectively designates one of the standard setting conditions and the deceleration setting conditions;
• wherein the left and right wheels are caused to turn around a turn center position corresponding to a turn instruction in accordance with the designated setting conditions;
• and
• wherein the unit that selectively designates one of the standard setting conditions and the deceleration setting conditions is a selection switch or a structure that switches between the standard setting drive mode and the deceleration setting mode in response to a signal of a slope-to-horizontal plane angle from a slope sensor.