A rollator includes a support frame assembly, a seat having first and second positioning notches, and a backrest unit including a backrest frame having two opposite ends pivoted to the support frame assembly, and a positioning frame having two opposite ends pivoted to the backrest frame. The positioning frame is engageable with a selected one of the first and second positioning notches. The backrest frame cooperates with the seat unit to define a seating space that faces rearward when the positioning frame is engaged with the first positioning notch, and cooperates with the seat unit to define a seating space that faces forward when the positioning frame is engaged with the second positioning notch.一種雙向助行車,包含一支撐架組、多個安裝於該支撐架組之底部的輪子、一座墊及一靠背單元。座墊包括一安裝於該支撐架組的座墊本體、一自座墊本體上表面朝前下方凹陷延伸的第一定位槽,及一自座墊本體上表面朝後下方凹陷延伸的第二定位槽。靠背單元包括一以其兩端樞接於該支撐架組的靠背支架,及一以其兩端樞接於該靠背支架的定位支架,在該定位支架卡入該座墊的第一定位槽的狀態下,靠背支架定位且與該座墊界定出一供朝後乘坐的乘坐空間,在該定位支架卡入該座墊的第二定位槽的狀態下,靠背支架定位且與該座墊界定出一供朝前乘坐的乘坐空間。
