Abstract: In an inside of a cassette 11 which is stored integrally with a toilet seat lid 1, a plurality of toilet seat covers 12 are stored, and by opening and closing of the toilet seat lid 1 which stores the cassette 11, a part of the toilet seat cover 12 which is exposed from a lower lid 7 of the cassette 11 contacts an adhesive button 3 which is disposed on a toilet set 14 or a seat 2 of the toilet seat and adheres to this, and thereby, the toilet seat cover 12 is set on the toilet seat 14 or the seat 2 of the toilet seat. Also, in order to facilitate refilling of the toilet seat covers 12 into the inside of the cassette 11, disposed are fixing means and opening and closing means by which the toilet seat lid 1 and the cassette 11, and an upper lid 5 and the lower lid 7 of the cassette 11 can be easily detached and attached, or opened and closed.