Wiper apparatus for wiping a window glass of a vehicle includes: an arm shank pivotably supported at its proximal end portion on a vehicle near a window glass and having an opening portion opposed to the window glass and an inner space located inwardly of the opening portion; an arm piece mounted to a distal end portion of the arm shank and having a wiper blade attached thereto; and a wind-noise preventing device provided between the arm piece and the proximal end portion of the arm shank and having a portion protruding through the opening portion toward the window glass so as to prevent traveling wind from entering the inner space through the opening portion.