A guitar strap 10 includes an adjuster 13 by which the length of a second belt section 17 is adjusted. The adjuster 13 includes a base 31, a lever 32 manipulated to adjust the length of the second belt section 17, and a torsion spring 38 urging the lever 32 to pivot in a first direction. The second belt section 17 is clamped by the base 31 and the lever 32 due to urging force of the torsion spring 38. The second belt section 17 is released from a state clamped by the base 31 and the lever 32 by pivoting the lever 32 in a second direction, which is different from the first direction, against the urging force of the torsion spring 38.