Joining structure and method for manufacturing same

A method for manufacturing a joint structure formed by joining a first plate-shaped member made of steel and a second plate-shaped member made of steel, the second plate-shaped member having a shape that is longer in a longitudinal direction than in a lateral direction, the method comprising:

• overlapping the first plate-shaped member and the second plate-shaped member by placing the second plate-shaped member on the first plate-shaped member;
• after the overlapping, joining each of both edge portions of the second plate-shaped member by forming a weld metal along the longitudinal direction to the first plate-shaped member, and the weld metal extends further outward in the lateral direction than the edge portions of the second plate-shaped member,
• wherein the weld metal is formed by a hybrid welding in which a laser is added as a heat source during arc welding such that the weld metal extends around both of the edge portions of the second plate-shaped member along the longitudinal direction such that the weld metal extends continuously over an entire periphery of the edge portions along the longitudinal direction of the second plate-shaped member.