A straddled vehicle comprising: a head pipe; a down frame extending downward from the head pipe and having a tubular shape; a first lower frame, a second lower frame, a first rear frame, and a second rear frame, wherein the head pipe is inclined rearward and upward in a vehicle side view, the first lower frame and the second lower frame are connected to a lower portion of the down frame, the first lower frame extends leftward and rearward from the down frame, the second lower frame extends rightward and rearward from the down frame, the first rear frame extends rearward and upward from the first lower frame, the second rear frame extends rearward and upward from the second lower frame, the first lower frame, the second lower frame, the first rear frame, and the second rear frame each have a tubular shape; a lid member disposed in the down frame and fixed to the down frame, characterized by a first side frame extending rearward and to one of left and right from the down frame; a second side frame extending rearward and to the other of the left and right from the down frame; wherein the first side frame and the second side frame are separate parts from each other, the first side frame includes a first connection end connected to the down frame, the second side frame includes a second connection end connected to the down frame, the first side frame is disposed below the first lower frame, the first side frame is connected to the down frame and the first lower frame, the first side frame is connected to the down frame at a position lower than the first lower frame, the second side frame is disposed below the second lower frame, the second side frame is connected to the down frame and the second lower frame, the second side frame is connected to the down frame at a position lower than the second lower frame, and in the vehicle side view, the lid member overlaps with the first connection end of the first side frame. a head pipe; a down frame extending downward from the head pipe and having a tubular shape; a first lower frame, a second lower frame, a first rear frame, and a second rear frame, wherein the head pipe is inclined rearward and upward in a vehicle side view, the first lower frame and the second lower frame are connected to a lower portion of the down frame, the first lower frame extends leftward and rearward from the down frame, the second lower frame extends rightward and rearward from the down frame, the first rear frame extends rearward and upward from the first lower frame, the second rear frame extends rearward and upward from the second lower frame, the first lower frame, the second lower frame, the first rear frame, and the second rear frame each have a tubular shape; a lid member disposed in the down frame and fixed to the down frame, characterized by a first side frame extending rearward and to one of left and right from the down frame; a second side frame extending rearward and to the other of the left and right from the down frame; wherein the first side frame and the second side frame are separate parts from each other, the first side frame includes a first connection end connected to the down frame, the second side frame includes a second connection end connected to the down frame, the first side frame is disposed below the first lower frame, the first side frame is connected to the down frame and the first lower frame, the first side frame is connected to the down frame at a position lower than the first lower frame, the second side frame is disposed below the second lower frame, the second side frame is connected to the down frame and the second lower frame, the second side frame is connected to the down frame at a position lower than the second lower frame, and in the vehicle side view, the lid member overlaps with the first connection end of the first side frame.