Provided are a medicine packaging device, a medicine packaging paper remaining amount judgment method, and a medicine packaging paper roll that make it possible to accurately judge the remaining amount of medicine packaging paper. A roll support unit 2 to which the core tube 201 of the medicine-wrapping paper roll 200 is mounted, a sensor 24a provided in the roll support unit 2 that outputs a count value corresponding to the rotation amount, and an antenna connected to the roll support unit 2 25, and information is written to the core tube IC tag 202 provided in the core tube 201 using the antenna 25, and the wireless reader / writer 26 that reads the written information, and information to be written to the core tube IC tag 202 Based on the information generation unit 57a for generating the remaining amount of paper and the dimensional information of the core tube 201, the remaining paper amount estimation unit 57 for estimating the current remaining amount of paper, and the core tube IC tag 202 with a reference time point count. And a controller 5 that selectively performs processing when a value has not yet been written and processing when a value has already been written.薬剤分包紙の紙残量を正確に判断することを可能にする薬剤分包装置、薬剤分包紙残量判断方法、薬剤分包紙ロールを提供する。薬剤分包紙ロール２００の芯管２０１が装着されるロール支持部２と、上記ロール支持部２に設けられ、回転量に応じたカウント値を出力するセンサ２４ａと、上記ロール支持部２にアンテナ２５を有し、このアンテナ２５を用いて上記芯管２０１に設けられた芯管ＩＣタグ２０２に情報を書き込むとともに、書き込んだ情報を読み取る無線リーダライタ２６と、上記芯管ＩＣタグ２０２に書き込む情報を生成する情報生成部５７ａと、上記情報および上記芯管２０１の寸法情報とに基づいて、現在の紙残量を推定する紙残量推定部５７と、上記芯管ＩＣタグ２０２に基準時点カウント値が未だ書き込まれていなかった場合の処理と既に書き込まれていた場合の処理とを選択的に行うコントローラ５と、を備える。
