Importance

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Abstract

A length adjusting device for fastening straps of a mask includes an oblong elastic thin plate with a plurality of stepped hook portions. One strap of fastening straps of the mask is to be detachably fitted at a base end portion of the elastic thin plate and another strap of the mask is to be engageably fitted on the stepped hook portions. The elastic thin plate may have a piercing hole at its base end portion, into which the strap of the mask is to be detachably fitted, and/or have opposing hook portions which opposingly project from both its upper and lower sides and incline toward the base end of the elastic thin plate. The piercing hole may have a cut and the cut may extend slantingly toward a tip side of the elastic thin plate.

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First Claim