BELT LENGTH ADJUSTER

The present invention provides a belt length adjuster which makes it easy to carry out a belt length adjustment operation with eyewear or the like worn, has a simple structure, allows production costs to be reduced as well, and has the advantage of causing low fluid resistance during competitive swimming and the like because of compactness when used for swimming goggles. A belt length adjuster includes a belt pinching frame F, the belt pinching frame F including a first pinching frame 1 and a second pinching frame 2 pivotally intersecting each other, a crossing angle ± between the first and second pinching frames 1 and 2 being able to be opened and closed, wherein a first end of a belt B is inserted into a first end of the belt pinching frame F and a second end of the belt B is inserted into a second end of the belt pinching frame F, the first end and the second end of the belt B are pinched between the first and second pinching frames 1 and 2 when the crossing angle ± is fully closed, and the first end and the second end of the belt B are released from pinching when the crossing angle ± is fully opened.