A straddled vehicle comprising: a head pipe ; a vehicle body frame including a main frame and a rear frame , the main frame extending backward, with regards to a back-and-forth direction of the vehicle, from the head pipe , the rear frame extending backward, with regards to a back-and-forth direction of the vehicle, from the main frame ; a side cover fixed to the vehicle body frame ; a fuel tank supported by the vehicle body frame ; and a tank cover connected to the fuel tank , the tank cover including a cover body , the cover body disposed directly above the side cover in order to cover the fuel tank , wherein the side cover is fixed to the tank cover on an inner side, with regards to a width direction of the vehicle, of the tank cover , the side cover including at least one cover fastening portion and at least one frame fastening portion , the at least one cover fastening portion fixed to the tank cover and disposed to overlap with the tank cover in a vehicle side view, the at least one frame fastening portion fixed to the vehicle body frame and disposed below, with regards to an up-and-down direction of the vehicle, the cover fastening portion , whereby the tank cover further includes an extending portion , the extending portion extending more downward, with regards to an up-and-down direction of the vehicle, than the fuel tank , the extending portion connected to the side cover , characterised in that the extending portion includes an opening portion for inserting therein one of the at least one cover fastening portion , and the side cover is fitted to the tank cover through the opening portion . a head pipe ; a vehicle body frame including a main frame and a rear frame , the main frame extending backward, with regards to a back-and-forth direction of the vehicle, from the head pipe , the rear frame extending backward, with regards to a back-and-forth direction of the vehicle, from the main frame ; a side cover fixed to the vehicle body frame ; a fuel tank supported by the vehicle body frame ; and a tank cover connected to the fuel tank , the tank cover including a cover body , the cover body disposed directly above the side cover in order to cover the fuel tank , wherein the side cover is fixed to the tank cover on an inner side, with regards to a width direction of the vehicle, of the tank cover , the side cover including at least one cover fastening portion and at least one frame fastening portion , the at least one cover fastening portion fixed to the tank cover and disposed to overlap with the tank cover in a vehicle side view, the at least one frame fastening portion fixed to the vehicle body frame and disposed below, with regards to an up-and-down direction of the vehicle, the cover fastening portion , whereby the tank cover further includes an extending portion , the extending portion extending more downward, with regards to an up-and-down direction of the vehicle, than the fuel tank , the extending portion connected to the side cover , characterised in that the extending portion includes an opening portion for inserting therein one of the at least one cover fastening portion , and the side cover is fitted to the tank cover through the opening portion . <EOS>