PROBLEM TO BE SOLVED: To provide a medicinal solution preparation implement with a novel structure, capable of easily and stably extinguishing bubbles generated within a vial during dissolving operation with more excellent operability.SOLUTION: The medicinal solution preparation implement includes: a body 12 with a vial attaching part 18 from which a puncture needle 24 projects and an air pathway 58 which penetrates through the puncture needle 24, one end of which is opened at a distal end 26 of the puncture needle 24 and the other end of which is opened on the outer peripheral surface of the body 12. An opening of the air pathway 58 on the outer peripheral surface of the body 12 is openably sealed with a slit valve 50, and a push button 56 is elastically supported to the outer side of the slit valve 50. By pushing the push button 56, a projection 68 of the push button 56 is inserted into the slit valve 50 and the slit valve 50 is opened.COPYRIGHT: (C)2013,JPO&INPIT【課題】溶解操作中にバイアル内に生じた泡を、より優れた操作性をもって容易且つ安定的に消滅させることの出来る、新規な構造の薬液調製用器具を提供すること。【解決手段】穿刺針24が突設されたバイアル装着部18を備えた本体部12と、前記穿刺針24の内部を貫通して一端が該穿刺針24の先端部26に開口すると共に他端が前記本体部12の外周面に開口するエア通路58とを備えると共に、該エア通路58における前記本体部12の外周面の開口部を、スリット弁50によって開口可能に密封する一方、該スリット弁50の外方側に弾性支持された押釦部56を設け、該押釦部56を押圧することにより該押釦部56の突起68が前記スリット弁50に差し込まれて該スリット弁50が開口されるようにした。【選択図】図3