The present invention relates to a stimulation device (1) configuredfor interacting with an external body portion of a user, in particular theuser'sback. The interaction consists of exerting a mechanic action upon the user'sbody,such as massage stimulation and/or skin scrubbing stimulation. For thispurpose,the stimulation device (1) comprises a frame (50) provided with at least oneupright element (2) extending along a longitudinal direction (L) preferablycorresponding,in use, to a body height of the user, and stimulation means (4), slidablycoupled with the upright element (2) according to the 10 longitudinaldirection(L). Further, the stimulation device (1) is apt to be installed, in use, in awall unit(100) for a shower cabin assembly (1000).
