A straddled vehicle comprising: a head pipe; a main frame extending rearward from the head pipe; a rear arm supported by the main frame such that the rear arm rotates around a pivot axis (Ap) extending in a vehicle width direction; a rear wheel (Wr) supported by the rear arm; an engine at least a portion of which is disposed at a position below the main frame and in front of the pivot axis (Ap) and including a crankcase and a cylinder extending upward from the crankcase; an air cleaner disposed behind the cylinder such that a front end of the air cleaner is disposed further to the rear than a rear end of the cylinder; a fuel tank disposed at a position behind the head pipe and above the engine; and a main seat disposed behind the fuel tank and on which a rider sits; a tandem seat at least a portion of which is disposed at a position further to the rear and higher than the main seat and on which a passenger sits; wherein the fuel tank includes an upper edge portion at which a fuel filler hole is disposed, a lower edge portion disposed below the upper edge portion, a rear edge portion disposed between the upper edge portion and the lower edge portion in a vehicle up-down direction and extending in the vehicle up-down direction, and a first inclined portion extending forward and upward and coupling the rear edge portion and the upper edge portion with each other, a dimension in the vehicle up-down direction from the upper edge portion of the fuel tank to the lower edge portion of the fuel tank is greater than a dimension of the upper edge portion of the fuel tank in a vehicle front-rear direction, and a center of the tandem seat in the vehicle front-rear direction is disposed further to the front than a rotation center (Cr) of the rear wheel (Wr) in the side view of the straddled vehicle, characterized in that the tandem seat is formed separately from the main seat, at least a portion of a front edge of the main seat is disposed behind the rear edge portion of the fuel tank in a plan view of the straddled vehicle, and a rear end of the fuel tank and a front end of the main seat are disposed further to the front than the pivot axis (Ap) in a side view of the straddled vehicle. a head pipe; a main frame extending rearward from the head pipe; a rear arm supported by the main frame such that the rear arm rotates around a pivot axis (Ap) extending in a vehicle width direction; a rear wheel (Wr) supported by the rear arm; an engine at least a portion of which is disposed at a position below the main frame and in front of the pivot axis (Ap) and including a crankcase and a cylinder extending upward from the crankcase; an air cleaner disposed behind the cylinder such that a front end of the air cleaner is disposed further to the rear than a rear end of the cylinder; a fuel tank disposed at a position behind the head pipe and above the engine; and a main seat disposed behind the fuel tank and on which a rider sits; a tandem seat at least a portion of which is disposed at a position further to the rear and higher than the main seat and on which a passenger sits; wherein the fuel tank includes an upper edge portion at which a fuel filler hole is disposed, a lower edge portion disposed below the upper edge portion, a rear edge portion disposed between the upper edge portion and the lower edge portion in a vehicle up-down direction and extending in the vehicle up-down direction, and a first inclined portion extending forward and upward and coupling the rear edge portion and the upper edge portion with each other, a dimension in the vehicle up-down direction from the upper edge portion of the fuel tank to the lower edge portion of the fuel tank is greater than a dimension of the upper edge portion of the fuel tank in a vehicle front-rear direction, and a center of the tandem seat in the vehicle front-rear direction is disposed further to the front than a rotation center (Cr) of the rear wheel (Wr) in the side view of the straddled vehicle, characterized in that the tandem seat is formed separately from the main seat, at least a portion of a front edge of the main seat is disposed behind the rear edge portion of the fuel tank in a plan view of the straddled vehicle, and a rear end of the fuel tank and a front end of the main seat are disposed further to the front than the pivot axis (Ap) in a side view of the straddled vehicle.