A straddled vehicle comprising: a vehicle body frame including a head pipe; an engine supported by the vehicle body frame; a steering device supported by the head pipe, the steering device including a front wheel, the front wheel being disposed below the head pipe; a storage box supported by the vehicle body frame, the storage box being disposed backward of the front wheel; a seat disposed directly above the storage box; an exterior cover at least in part overlapping the vehicle body frame as seen in a front view; and an engine control unit controlling the engine, wherein the exterior cover includes a front cover disposed in front of the head pipe, a back cover disposed behind the head pipe, a bottom cover disposed behind the front wheel and in front of the back cover, and a flat footboard extending backward from a lower end of the back cover, the back cover includes an upper portion located above a front end of the front cover, and a lower portion located below the front end of the front cover, the exterior cover includes a first storage space formed in front of the upper portion and behind the front cover, and a second storage space formed in front of the lower portion and behind the bottom cover, the engine control unit has a shape dimensioned to be greater in both a width direction thereof and a length direction thereof than in a thickness direction thereof, and the engine control unit is disposed on one of right and left sides of a vehicle center in a vehicle width direction, characterized in that the engine control unit is disposed in the second storage space, and the engine control unit is disposed such that the thickness direction thereof is arranged obliquely to a vehicle back-and-forth direction as seen in a vehicle plan view, and, on a cross section taken orthogonally to an up-and-down direction to include the engine control unit, a rear end of the engine control unit is disposed further inward in the vehicle width direction than a front end of the engine control unit. a vehicle body frame including a head pipe; an engine supported by the vehicle body frame; a steering device supported by the head pipe, the steering device including a front wheel, the front wheel being disposed below the head pipe; a storage box supported by the vehicle body frame, the storage box being disposed backward of the front wheel; a seat disposed directly above the storage box; an exterior cover at least in part overlapping the vehicle body frame as seen in a front view; and an engine control unit controlling the engine, wherein the exterior cover includes a front cover disposed in front of the head pipe, a back cover disposed behind the head pipe, a bottom cover disposed behind the front wheel and in front of the back cover, and a flat footboard extending backward from a lower end of the back cover, a back cover disposed behind the head pipe, a bottom cover disposed behind the front wheel and in front of the back cover, and a flat footboard extending backward from a lower end of the back cover, the back cover includes an upper portion located above a front end of the front cover, and a lower portion located below the front end of the front cover, an upper portion located above a front end of the front cover, and a lower portion located below the front end of the front cover, the exterior cover includes a first storage space formed in front of the upper portion and behind the front cover, and a second storage space formed in front of the lower portion and behind the bottom cover, a first storage space formed in front of the upper portion and behind the front cover, and a second storage space formed in front of the lower portion and behind the bottom cover, the engine control unit has a shape dimensioned to be greater in both a width direction thereof and a length direction thereof than in a thickness direction thereof, and the engine control unit is disposed on one of right and left sides of a vehicle center in a vehicle width direction, characterized in that the engine control unit is disposed in the second storage space, and the engine control unit is disposed such that the thickness direction thereof is arranged obliquely to a vehicle back-and-forth direction as seen in a vehicle plan view, and, on a cross section taken orthogonally to an up-and-down direction to include the engine control unit, a rear end of the engine control unit is disposed further inward in the vehicle width direction than a front end of the engine control unit.