In a wig base comprising an occipital base A, a parietal base B, a side base C and a nape portion base D, one end of a first adjusting belt 10 which can expand and contract is fixed to the side base C, one end of a second adjusting belt 20 which can expand and contract is fixed to the parietal base B, and one end of a third adjusting belt 30 which can expand and contract is fixed to the nape portion base D respectively. Other ends of first to third adjusting belts are coupled at one position in a trifurcate shape, thereby forming an adjusting mechanism. The wig base having this configuration can be adjusted finely so as to make the wig base fit a wearer's head with using a pull from three directions by the three adjusting belts.
