A cord lock includes a male tool and a female tool that receives a part of the male tool by pressing the male tool against a biasing force of a biasing device, and so as to match cord eyelets formed in sides of the male tool and the female tool each other at a predetermined pressing position of the male tool. An engaging part that is engaged with an engaged part of the female tool by the biasing force of the biasing device to prevent the male tool from slipping out of a position before the pressing operation, is formed on a side of the male tool intersecting a direction in which the eyelet passes through, and at a position closer to a pressing backward side than a hole edge located on a pressing forward side of the eyelet.