A wiper system according to the present invention includes wiper blades (2a, 2b) that perform a reciprocating wiping operation on a windshield (3), and a raindrop sensor (9) that detects the current amount of rainfall based on water droplets adhering to the windshield (3). If rainfall more than or equal to a predetermined amount is detected by the raindrop sensor (9), a heavy rain mode in which a wiping range of the wiper blades (2a, 2b) is made narrower than in a normal wiping operation is carried out. In the heavy rain mode, the wiper blade (2a) arranged on the driver's side is activated at high speed (Hi) within a heavy rain time wiping area X set near the forward field of view of the driver to ensure the field of view of the driver.