A guide wire including a flexible first core wire which has a first plate-shaped portion having a plate shape and a first linear portion having a linear shape that is continuous to the first-plate shaped portion. The width of the first plate-shaped is larger than the width of the first linear portion. The guide wire includes a flexible second core wire which has a second plate-shaped portion having a plate shape and a second linear portion having a linear shape that is continuous to the second-plate shaped portion. The width of the second plate-shaped portion is larger than the width of the second linear portion. The second plate-shaped portion axially overlaps the first linear portion, and the second linear portion axially overlaps the first plate-shaped portion.