Abstract: A carryable optical magnifying device can be worn during use by the user, and relates in particular to binoculars or field-glasses with a carrying strap attached to the housing of the magnifying device. The carrying strap is passed outward laterally of the eyepiece region of the magnifying device through an opening in the outer portion of the housing. The opening has substantially the same cross section as the carrying strap. The carrying strap has at its end within the housing a thickening that is larger than the opening for the carrying strap in the outer portion of the housing. An inner cavity into which the thickening is inserted, is formed within the housing with the cooperation of a clamp member.