A wiper device for removing foreign substances that are stuck on a windshield in accordance with an embodiment of the present invention includes: a contact member configured for wiping out the foreign substances; a support member made of an elastic material and configured for elastically supporting the contact member in such a way that the contact member is in close contact with the windshield; a yoke configured for supporting the support member; a center cover configured for covering the yoke and having a wiper arm connected thereto; and an extension cover having one end thereof hinge-coupled to the center cover and the other end thereof extended in a lengthwise direction of the support member. The yoke can be hinge-coupled with the center cover or the extension cover and can have a hinge-axle thereof arranged in a same line as a hinge-axle connecting the center cover with the extension cover.