STRAP

A strap includes a base having a plate shape and detachably attached to a terminal rear surface of a portable terminal, a rotary plate attached to a base front surface of the base so as to be rotatable around a rotation axis perpendicular to the base front surface, an annular holding portion fixed to a rotary plate front surface of the rotary plate and into which a palm portion is inserted from a finger, and an adjuster portion having a foldable portion and fixed to the base rear surface of the base. The foldable portion varies a distance perpendicular to the base rear surface from the base rear surface of the base.