A paper holder 14 is provided in an open part 4 on the side opposite to the folded part 3 so that it extends inside the main body 2, while a sidehead piece 15 is provided at the base part of the paper holder 14 so that it projects outside the main body 2. 折曲部3と反対側の開放部4に紙押え14を本体2の内側へ延びるように設け、紙押え14の基部に見出し片15を本体2の外側へ突設する。 - 特許庁