To solve a problem that the conventional handcrafted Japanese cloth sandal uses a polypropylene rope as a core, however, an inexperienced crafter has difficulty to adjust a size and easily loses the shape by the difficulty of moderating a force, furthermore, when washing it, it takes two day for drying and, in most cases, the stiffener has the problem.

A polyethylene foam mold stiffener by size is used instead of the conventionally used polypropylene rope, and the mold core allows persons from children to the elderly to simply make Japanese cloth sandals in a short period of time by just covering the cloth along the mold stiffener, has a light wearing property with an appropriate elasticity to make a wearer feel comfortable and is quickly dried when washing.