To prevent leakage of a follower and an ink in an ink housing tube to the outside on impact.

In an ink housing tube 4, an ink 41 and a follower 42 in a greased state are housed. The ink housing tube 4 is housed in a barrel 2. A tail plug 5 is inserted in a rear end opening of the barrel 2. A bottomed barrel part 51 insertable into the rear end opening of the barrel 2 is provided at the plug 5. The bottomed barrel part 5 has its front end opened and its rear end closed. A contacting part 8 which abuts against the rear end of the ink housing tube 4 in a shaft direction, and in a peripheral contact is provided at the front end of the bottomed barrel part 51.