| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that the deformation after molding is easy to occur due to the shrinkage of a material, particularly, unfittable for the molding of a large-sized part, and water is apt to leak and beautifulness is apt to be impaired. SOLUTION: The toilet flushing device is provided with a toilet seat 25, a water storage tank 23 in which flushing water flushing the internal surface of a stool 22 is stored and an external facing case 21 covering the water storage tank 23, the mechanical strength of the upper section of the external facing case 21 is increased by constituting the external facing case 21 of a side wall surface 27 formed in a fan shape towards a lower section and a top surface 28 forming a top face, and deformation due to the shrinkage of the material in the case of molding can be inhibited largely. Accordingly, the classifications of a used resin material are extended, for example, a material which has been unfit for a large-sized molded form such as a polypropylene resin having a large shrinkage factor in spite of a low cost can be used.
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