A back massaging device includes a back part, a transmission module, a massage member, a control unit and a manual control device. The transmission module is movably located in the back part. The massage member includes an arm and a massage protrusion for massaging a human body. The support arm is respectively fixed to the transmission module and the massage protrusion. The control unit is used to instruct the transmission module to drive the massage protrusion. The manual control device is provided with an analog direction control interface. The analog direction control interface is used to instruct the control unit to move the massage protrusion towards a moving direction.一種椅背按摩裝置包括一椅背、一傳動模組、一按摩件、一控制單元與一手控裝置。傳動模組可移動地位於椅背內。按摩件包括一支臂與一按摩凸點。支臂分別固接傳動模組與按摩凸點，按摩凸點用以對人體按摩。控制單元用以指示傳動模組帶動按摩凸點。手控裝置具有一類比方向控制介面。類比方向控制介面用以指示控制單元朝一移動方向移動按摩凸點。
