To provide a low-cost pressurized pen which can smoothly supply ink, prevent an excess pressure inside an ink storage pipe and an ink leakage from occurring, and also can be easily used with a pen point turned upward.

In this pressurized pen, a pressurizing pump mechanism 10 for pressurizing the interior of the ink storage pipe 3 is configured of a pressurized chamber 14 which communicates with the interior of the ink storage pipe 3, a sphere 16 which is arranged in the way that it can be press-fitted into the pressurized chamber 14, and also can be easily elastodeformed, a compression spring 17 which urges the sphere 16 in a direction where the sphere 16 breaks away from inside the pressurized chamber 14, and a pressing rod 18 which can press-fit the sphere 16 into the pressurized chamber 14 airtightly by moving the sphere 16 forward resisting the urging force of the compression spring 17. In addition, the interior of the ink storage pipe 3 is pressurized by squeezing the sphere 16 into the pressurized chamber 14 resisting the urging force of the compression spring 17 by the pressing rod 18. Further, the sphere 16 is made to break away from inside the pressurized chamber 14 by the urging force of the compression spring 17 through freeing the squeezing-in of the pressing rod 18, and thus the interior of the ink storage pipe 3 can be made breathable to the open air.