A positioning structure of a plastic disk in a massaging device may include a massaging unit, a connecting unit and a locking unit. The massaging unit has a protruding block that has a through hole. One end of the connecting unit has a receiving space that is used to receive the protruding block, a fixed hole of the connecting unit aligned with the through hole, and a plurality of positioning slots circularly formed at outer periphery of the fixed hole of the connecting unit. The locking unit has a head portion and a tubular unit extending from the head portion, wherein the tubular unit of the locking unit passes through the through hole and fixed hole, and a screw is used to secure the tubular unit to connect the massaging unit and the connecting unit.一種按摩膠盤組合定位結構,其包括有:一按摩件形成有一凸塊,且該凸塊處貫穿有一通孔,一連結件一端形成有一容置空間,該連結件以容置空間套設於按摩件之凸塊處,且該連結件正對通孔處開設有一固定孔,又該連結件於固定孔之外周緣環狀開設有複數個相通容置空間之定位槽,一鎖合件設有一頭部,並由頭部延伸有一管體,該鎖合件之管體由按摩件端穿過通孔與固定孔,且該管體於連結件端鎖設有一螺栓,藉此構成按摩件與連結件之連結,並利用定位槽形成按摩件快速組接與拆卸之使用效果,俾以提高其組接穩定性。10‧‧‧按摩件11‧‧‧凸塊12‧‧‧通孔13‧‧‧碗狀部14‧‧‧彈性圈20‧‧‧連結件22‧‧‧固定孔23‧‧‧定位槽24‧‧‧環槽30‧‧‧鎖合件31‧‧‧頭部32‧‧‧管體33‧‧‧螺栓34‧‧‧蓋體341‧‧‧平面部
