To provide a garment-manufacturing information-marking device capable of giving pictures having an always stable masking force without changing the concentration of the drawn line parts of a finally drawn picture from that of a first drawn picture, even the pictures are drawn with an ink stayed in an ink tank for a long time.

A heater 12 is disposed at a place slightly upper from the lowest ink-supplying nozzle 10 of an ink tank 6 so as to surround the ink-supplying nozzle 10. A temperature sensor 14 is also disposed above the ink-supplying nozzle 10 and connected to a control circuit 16. The control circuit 16 controls so that the electric voltage of an electric source 18 is applied to the heater 12 in response to the signal of the temperature sensor 14 to convect the ink 8 at a constant temperature.