To provide a wet stamping device for a ceramic product constituted so as to dispense with adjusting work for making a stamping depth due to a stamping punch equipped with a plurality of punches almost constant at every product and having a simple constitution.

When the stamping punch 4 is attached to the lower end of a cylinder rod 3, the almost vertical stroke direction ST of the cylinder rod 3 and the protruding direction of the respective punches 5a-5c from the punch forming surface 4a of the stamping punch 4 are allowed to coincide with each other and protrusion lengths of the respective puches 5a-5c from the punch forming surface 4a are adjusted to make roughly equal the opposed intervals between the stamping surfaces 6a-6c of the leading ends of the respective punches 5a-5c and the surface 11a to be stamped of a molded product 11. The stamping surfaces 6a-6c of the respective punches 5a-5c are formed so that the curvature of each of them becomes almost equal to the curvature of the surface 11a to be stamped of the molded product 11.