A massaging device includes a housing (10) having a chamber (13) and a mouth (14) communicating with the chamber (13) of the housing (10) for filling a fluid (80) into the chamber (13) of the housing (10), and a cover (30) engaged with the mouth (14) of the housing (10) for enclosing the chamber (13) of the housing (10) and for retaining the fluid (80) within the chamber (13) of the housing (10). The housing (10) includes a number of peripheral protrusions (11) for forming one or more peripheral recesses (12). The cover (30) includes one or more depressions (32) for forming a knob (33). The housing (10) includes a casing (20) extended into the housing (10).
