A straddled vehicle comprising: a frame including: a main frame extending rearward and downward from a front of the straddled vehicle; a seat frame connected to the main frame and extending rearward from the main frame; and a back stay connected to the main frame in a position lower than a connecting position of the main frame and the seat frame, extending rearward and upward from the main frame, and connected to the seat frame in a position rearward of the connecting position of the main frame and the seat frame; a seat fixed to the seat frame by a bolt; a side cover having at least part thereof disposed, in a side view of the vehicle, in a first area surrounded by the main frame, the seat frame, and the back stay; a lock attached to the side cover and operable by a key to fix the side cover to the frame; a junction member for detachably joining the side cover to the frame; and a hook supported by the frame; wherein the side cover, in the side view of the vehicle, overlaps at least part of at lease one of a battery, an air cleaner, and a tool compartment in the first area; the junction member joins the side cover to the frame to be slidable in a first direction relative to the frame; the junction member includes: a first member fixed to the frame; and a second member fixed to the side cover for joining to and separating from the first member by moving in the first direction relative to the first member; the first direction has a first component (y) extending in a transverse direction of the straddled vehicle, and a second component (xz) extending perpendicular to the transverse direction and larger than the first component (y); when the junction member joins the side cover to the frame, the junction member prohibits the side cover from moving in the transverse direction relative to the frame; an upper end of the hook overlaps the side cover in the side view of the vehicle; characterized in that a bottom of the hook does not overlap the side cover in the side view of the vehicle; and the hook is disposed in a position closer to the junction member than to the lock in the side view of the vehicle. a frame including: a main frame extending rearward and downward from a front of the straddled vehicle; a seat frame connected to the main frame and extending rearward from the main frame; and a back stay connected to the main frame in a position lower than a connecting position of the main frame and the seat frame, extending rearward and upward from the main frame, and connected to the seat frame in a position rearward of the connecting position of the main frame and the seat frame; a main frame extending rearward and downward from a front of the straddled vehicle; a seat frame connected to the main frame and extending rearward from the main frame; and a back stay connected to the main frame in a position lower than a connecting position of the main frame and the seat frame, extending rearward and upward from the main frame, and connected to the seat frame in a position rearward of the connecting position of the main frame and the seat frame; a seat fixed to the seat frame by a bolt; a side cover having at least part thereof disposed, in a side view of the vehicle, in a first area surrounded by the main frame, the seat frame, and the back stay; a lock attached to the side cover and operable by a key to fix the side cover to the frame; a junction member for detachably joining the side cover to the frame; and a hook supported by the frame; wherein the side cover, in the side view of the vehicle, overlaps at least part of at lease one of a battery, an air cleaner, and a tool compartment in the first area; the junction member joins the side cover to the frame to be slidable in a first direction relative to the frame; the junction member includes: a first member fixed to the frame; and a second member fixed to the side cover for joining to and separating from the first member by moving in the first direction relative to the first member; a first member fixed to the frame; and a second member fixed to the side cover for joining to and separating from the first member by moving in the first direction relative to the first member; the first direction has a first component (y) extending in a transverse direction of the straddled vehicle, and a second component (xz) extending perpendicular to the transverse direction and larger than the first component (y); when the junction member joins the side cover to the frame, the junction member prohibits the side cover from moving in the transverse direction relative to the frame;