A flat wiper blade may be provided that includes: a wiper strip 10 which wipes a wiping surface; a guide spring 30 which supports the wiper strip 10; a first spoiler 41 and a second spoiler 42 which are coupled to the guide spring 30 and include at least one catching part 45; and a seating part 100 which is coupled to the guide spring 30 in an attachable and removable manner. The seating part 100 includes at least one catching recess 145 which corresponds to the catching part 45. The catching recess 145 is coupled to the catching part 45. When a curvature is formed in the flat wiper blade, the first and second spoilers 41 and 42 become farther away from the seating part 100 in the longitudinal direction thereof.