The present invention relates to a wiper blade mounted to a wiper apparatus for a vehicle to wipe a windshield, a jig for heat treating a wiper frame of a wiper blade, and a method for machining a wiper frame using the same. An object of the present invention is to provide a wiper blade, which has a wiper frame formed to have elasticity, has an improved structure for securing a wiper strip, causes a wiper strip to be directly coupled with the wiper frame, and is easily assembled, thereby saving a time required for an assembling process and having improved durability and contacting force, a jig for heat treating a wiper frame of a wiper blade and a method for machining a wiper frame using the same. According to the present invention for achieving the object, there is provided a wiper blade for wiping a windshield, comprising a wiper strip in contact with the windshield, the wiper strip having rail grooves formed on both sides thereof; a wiper frame curved along its lengthwise direction and having elasticity to bring the wiper strip into contact with the windshield; a coupling slit formed in the wiper frame, the rail grooves of the wiper strip being slidably fitted to the coupling slit; and a coupling aperture formed in one end of the coupling slit and allowing the wiper strip to be inserted thereinto.