To make a toilet seat possible to be set onto a toilet whose hinge hole pitch is different.

This western-type toilet 1 has two set holes 5 on the rear top surface, into where two supporters 2 are set with set screws, respectively. A hinge axis 3 is loosely put into the seat-turning projections 4a at the rear end of a toilet seat 4. This structure is made to be capable of setting the toilet seat 4 and supporting it thereby so that the toilet seat 4 can freely be brought up and down via the supporters 2 at the both ends of the hinge axis 3 made from a material that can be cut off. A length-adjustable spacers 6 cover the hinge axis 3 between the supporters 2 and toilet seat turning projection 4a.