Abstract: A window corner flashing device includes a first and a second member. The first member includes a first section which is disposed adjacent a second section and is angled thereto. The first section and second section have a first edge and second edge, respectively, wherein the first member includes a first continuous flange disposed along the first and second edges of the first and second sections, respectively. The second member includes a first section having a third edge and a second section having a fourth edge. The second member further includes a first continuous mating edge which is disposed along the third and the fourth edge thereof. The first member is affixed to the second member by having the first continuous flange permanently affixed to the first continuous mating edge.