To provide a strap fastener for a beach sandal which can prevent a beach sandal from being fixed to a foot and being detached.SOLUTION: A shoe sole contact to be applied to the shoe sole of a beach sandal from the back side and straps 6, 7 made of flat rubber or cloth connected to a shoe sole contact and wrapped around an ankle and fixed , And the strap is wrapped around the ankle through the inside of the thongs 22 and 23 and fixed.(FIG.
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