Provided is a supporter in which it is possible to prevent floating of the supporter from the back portion of a wearer of the supporter in an upper side and a lower side of a back-contact section having a wide width and reliably support the waist portion of the wearer. The supporter 100 comprises: a band-shaped body section 10 provided with a back-contact section 11 which is brought into contact with the back portion of a wearer, and protruding sections 12 protruding to the right and left from both sides of the back-contact section 11; a pair of right and left auxiliary band sections 31 and 32 fixed so as to intersect one another in the vicinity of an upper side 11a of the back-contact section 11; a pair of right and left adjustment band sections 51 and 52 loosely inserted into annular rings 41 and 42 respectively disposed at the auxiliary band sections 31 and 32; and a band-shaped support band section 70 fixed to the vicinity of a lower side 11b of the back-contact section 11.