Abstract: This invention pertains to a windshield wiper blade apparatus for a motor vehicle that more effectively and perfectly completely clears away rainwater or and foreign objects, which stick to on the car windshield, with more definite contact force and without shaking. Also Furthermore, this invention more definitely clearly improves the organic coupling structure of the components that constitute the blade apparatus. More specifically, the blade (300) is inserted into the blade couplingblade-couplingunit (10) that is fixed to the rail spring (100); the clamp (400) is coupled to the rail spring (100) through four hook project ions (132) that are formed in the rail spring.