A wig base (11) has a first base (12) and a second base (13), wherein the first base (12) has a front portion (12a), a left side portion (12b), a right side portion (12c), a back portion (12d), and a top portion (12e), and is formed in the convex shape resembling the wig wearer's
head shape so as to cover a wig wearing region, wherein the second base (13) is extending belt-like in the
head shape to the left and right side portions (12b, 12c) from the back portion (12d) on the reverse side of the first base (12) along its outer periphery, and wherein the back portion (13a) of the second base portion (13) is fixed on the reverse side of the back edge portion (12D) of the first base (12), while the left and right side edge portions (12B, 12C) of the first base (12) and the left and right side portions (13B, 13C) of the second base (13) are detachable by attaching parts (16a, 16b), and the wig wearer can wash his or her
scalp while keeping the wig on by rolling up the front side of the wig from the front portion 12a of the first base (12).