To offer a rubber stopper in which a luer can be easily passed through and inserted even if it is mounted on an opening of a container main body and is allowed to stand for a long time and a resealing nature is improved when the luer is pulled out.

The rubber stopper 20 in this medical purpose container consist of a top surface part 21 which is mounted on an aperture edge 12 and plugs up the opening 11 and a stand 22 which is inserted in the opening 11 and is formed in such a condition that a slit 23 may not reach the inner surface from the outer surface. An anti-blocking agent is inserted in the slit 23 and a resealing ring 26, which presses in a direction that the slit 23 is blockaded, is mounted on the outer periphery of the top surface part 21. To the opening 11 of the container main body 10, the rubber stopper 20 is anchored so as to cover the rubber stopper 20. On the top surface of a cap 30, a sealing film 40 is stuck.