A wiper blade package has a mouth portion that is openable by being pressed in a lateral direction. The wiper blade package has a first panel, a second panel opposed to the first panel, and a pair of side panels. The first panel is bendable around a bend line extending in a longitudinal direction and has a lid flap at its end. The lid flap is foldable around the bend line and is pivotable around a hinge line intersecting the bend line. The second panel has an engagement flap at its end. The lid flap engages a free end of the engagement flap at its free end and thereby closes a receiving portion in which a wiper blade is received. The lid flap is pivoted from the engagement flap by pressing the side panels toward the receiving portion and thereby opens the receiving portion.