A straddled vehicle comprising a waterproof structure and an electrical component mounted in said structure, wherein the straddled vehicle includes a center axis extending in a front-rear direction of the straddled vehicle in a vehicle upper view; the electrical component includes a connection terminal to which a transmission line is connected; the waterproof structure includes a hole portion through which the transmission line passes; the hole portion is disposed on one of a left side and a right side with respect to the center axis; and wherein the waterproof structure further comprises: a lower cover including an electrical component housing covering the front, the rear, the sides and the bottom of the electrical component, a first surrounding wall portion surrounding the front, the rear and the sides of the electrical component housing, and a connecting portion connecting a lower end of the first surrounding wall portion and the electrical component housing; and an upper cover including a lid portion covering an upper opening end of the electrical component housing and a second surrounding wall portion extending from the lid portion toward the connecting portion and covering the front, the rear and the sides of the electrical component housing; the second surrounding wall portion is disposed at intervals from the electrical component housing and the first surrounding wall portion between the electrical component housing and the first surrounding wall portion; and a gap is formed between a tip of the second surrounding wall portion and the connecting portion, wherein the connecting portion of the lower cover includes a drain hole, characterized in that the connecting portion includes the hole portion, and the connection terminal is disposed on the other of the left side and the right side. the straddled vehicle includes a center axis extending in a front-rear direction of the straddled vehicle in a vehicle upper view; the electrical component includes a connection terminal to which a transmission line is connected; the waterproof structure includes a hole portion through which the transmission line passes; the hole portion is disposed on one of a left side and a right side with respect to the center axis; and wherein the waterproof structure further comprises: a lower cover including an electrical component housing covering the front, the rear, the sides and the bottom of the electrical component, a first surrounding wall portion surrounding the front, the rear and the sides of the electrical component housing, and a connecting portion connecting a lower end of the first surrounding wall portion and the electrical component housing; and an upper cover including a lid portion covering an upper opening end of the electrical component housing and a second surrounding wall portion extending from the lid portion toward the connecting portion and covering the front, the rear and the sides of the electrical component housing; the second surrounding wall portion is disposed at intervals from the electrical component housing and the first surrounding wall portion between the electrical component housing and the first surrounding wall portion; and a gap is formed between a tip of the second surrounding wall portion and the connecting portion, wherein the connecting portion of the lower cover includes a drain hole, characterized in that the connecting portion includes the hole portion, and the connection terminal is disposed on the other of the left side and the right side. a lower cover including an electrical component housing covering the front, the rear, the sides and the bottom of the electrical component, a first surrounding wall portion surrounding the front, the rear and the sides of the electrical component housing, and a connecting portion connecting a lower end of the first surrounding wall portion and the electrical component housing; and an upper cover including a lid portion covering an upper opening end of the electrical component housing and a second surrounding wall portion extending from the lid portion toward the connecting portion and covering the front, the rear and the sides of the electrical component housing; the second surrounding wall portion is disposed at intervals from the electrical component housing and the first surrounding wall portion between the electrical component housing and the first surrounding wall portion; and a gap is formed between a tip of the second surrounding wall portion and the connecting portion, wherein the connecting portion of the lower cover includes a drain hole, characterized in that the connecting portion includes the hole portion, and the connection terminal is disposed on the other of the left side and the right side.