Abstract: The present invention relates to hip-up underwear which prevents the hip of a wearer from dropping downward during daily life and corrects the body shape of the wearer. More particularly, the present invention relates to hip-up underwear using an elastic band, in which the elastic band is arranged at the rear surface of the underwear so as to cover the entirety of the waist and hip of the wearer, and the elastic band is fastened on the abdominal area of the wearer after the wearer puts on the underwear so as to prevent the hip of the wearer from being squashed flat and from being contorted on a mattress during sleeping. The hip-up underwear of the present invention can be worn during daily life or during sleep so as to shape-up the hip and gather, compress, and cover the belly fat of the wearer, thereby remarkably improving the effects of body shape correction through hip-up and compressing the belly fat of the wearer.