A straddled vehicle, comprising: a seat; a front seat frame disposed under the seat; a rear seat frame including a portion disposed rearward of the front seat frame; and right and left fasteners (37, 38) detachably fixing the rear seat frame to the front seat frame, characterized in that the front seat frame includes a left upper pipe disposed under the seat, a right upper pipe disposed under the seat, a left lower pipe disposed under the left upper pipe, a right lower pipe disposed under the right upper pipe, a left welding portion for welding the left upper pipe and the left lower pipe, a right welding portion for welding the right upper pipe and the right lower pipe, a left front joint disposed forward of a front end of the left welding portion, the left front joint being welded to the left upper pipe and the left lower pipe, and a right front joint disposed forward of a front end of the right welding portion, the right front joint being welded to the right upper pipe and the right lower pipe, the rear seat frame includes a left rear joint joined to the left front joint, and a right rear joint joined to the right front joint, the left fastener detachably fixes the left rear joint and the left front joint, and the right fastener detachably fixes the right rear joint and the right front joint. a seat; a front seat frame disposed under the seat; a rear seat frame including a portion disposed rearward of the front seat frame; and right and left fasteners (37, 38) detachably fixing the rear seat frame to the front seat frame, characterized in that the front seat frame includes a left upper pipe disposed under the seat, a right upper pipe disposed under the seat, a left lower pipe disposed under the left upper pipe, a right lower pipe disposed under the right upper pipe, a left welding portion for welding the left upper pipe and the left lower pipe, a right welding portion for welding the right upper pipe and the right lower pipe, a left front joint disposed forward of a front end of the left welding portion, the left front joint being welded to the left upper pipe and the left lower pipe, and a right front joint disposed forward of a front end of the right welding portion, the right front joint being welded to the right upper pipe and the right lower pipe, a left upper pipe disposed under the seat, a right upper pipe disposed under the seat, a left lower pipe disposed under the left upper pipe, a right lower pipe disposed under the right upper pipe, a left welding portion for welding the left upper pipe and the left lower pipe, a right welding portion for welding the right upper pipe and the right lower pipe, a left front joint disposed forward of a front end of the left welding portion, the left front joint being welded to the left upper pipe and the left lower pipe, and a right front joint disposed forward of a front end of the right welding portion, the right front joint being welded to the right upper pipe and the right lower pipe, the rear seat frame includes a left rear joint joined to the left front joint, and a right rear joint joined to the right front joint, a left rear joint joined to the left front joint, and a right rear joint joined to the right front joint, the left fastener detachably fixes the left rear joint and the left front joint, and the right fastener detachably fixes the right rear joint and the right front joint.