29 MEDICAL ADMINISTERING SETABSTRACTProvided is a medical administering set capable of performing satisfactory administering therapy by connecting a medical container to a tube reliably while holding liquid-tightness of the medical container, thereby preventing mixing of foreign matters to a liquid-like substance stored in the container, leakage of the liquid-like substance, and the likeA sealing section 155 having ribs 155a to 155c is formed on a protrusion 160 of a boat-shaped port 15 through intermediation of connection sections 1550a to 1550c. Slits 156a to 156c communicating with a flow path 159 are provided immediately below the respective ribs 155a to 155c. The respective ribs 155a to 155c are fitted in fitting-soetiona grooves 2030a to 2030c of a connector 20, and the connector 20 is rotated in a liquid-tight state to be locked with the boat-shaped port 15 side. With this operation, the connection sections 1550a to 1550c are broken, and the flow path 159 is opened to the inside of the connector 20 in the liquid-tight state.Figure 2