A mixing auxiliary tool (14) is a first mounting portion (54a) capable of mounting one pusher base end (30a) of the syringe Kit (12), a second mounting part (54B) capable of mounting the other pusher base end (30b) of the syringe Kit (12), and a first mounting part (54a) and a second mounting part (refer to Fig. 5d) A bar shaped connecting portion (58) for connecting 54B is provided.The width of the coupling portion (58) is smaller than the length along the long axis of the finger grip (26a, 26b).The grip (26a, 26b) protrudes outwardly from the connecting portion (58) in the state where one of the first mounting portion (54a) and the second pushing part (54B) are attached to the first mounting portion (54a) and the second attachment portion (54B).混合補助具（１４）は、シリンジキット（１２）の一方の押し子基端部（３０Ａ）が装着可能な第１装着部（５４Ａ）と、シリンジキット（１２）の他方の押し子基端部（３０Ｂ）が装着可能な第２装着部（５４Ｂ）と、第１装着部（５４Ａ）と第２装着部（５４Ｂ）を連結する棒状の連結部（５８）とを備える。連結部（５８）の幅は、フィンガグリップ（２６Ａ、２６Ｂ）の長軸に沿った長さよりも小さい。第１装着部（５４Ａ）と第２装着部（５４Ｂ）に一方及び他方の押し子基端部（３０Ａ、３０Ｂ）がそれぞれ装着されている状態で、フィンガグリップ（２６Ａ、２６Ｂ）が連結部（５８）よりも外側に突出する。
