Abstract: Provided is a sacroiliac belt having a high holding ability for a user's pelvis as well as a high tightening effect to the user's sacroiliac joints. The sacroiliac belt has a belt pair that forms a pelvic holding loop to hold a user's pelvis. The belt pair has a ilium belt that is wound around the user's waist, and a second belt selected from either a buttock belt that is wound around the user's waist passing under the user's buttocks, lifting up the buttocks, or a lumbar belt that is wound around the user's waist, passing a back side of the user's lumbar curve located immediately above the pelvis. Both ends of the second belt are each connected to the ilium belt inside both ends of the ilium belt.