[Problem]To provide a hydraulic massage apparatus advantageous in that excessive sagging of a flexible sheet is prevented without compromising a desired massage effect.[Solution]In a fluid tank (1) is installed a movable carriage (2) that is movable in a direction (1b) along one side of the fluid tank direction (1b). On the movable carriage (2) is mounted a jet fluid ejector that ejects a jet fluid (B) toward an opening (1a) of the fluid tank (1). A flexible sheet (5) is attached to the fluid tank (1) so as to cover at least a part of the opening (1a). A flexibility reinforcing strip (6) is disposed above the flexible sheet (5) in a manner that bridges both ends of the opening of the fluid tank (1) in a direction intersecting the one-side direction (1b). The flexibility reinforcing strip (6) is disposed in a portion of the flexible sheet (5) in contact with buttocks of a massage recipient when he/she is seated on and dismounted from the flexible sheet (5).
