CAP FOR MEDICAL USE

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PROBLEM TO BE SOLVED : To provide a technique excellent in holding power capable of preventing needle falling and a re-sealing property for preventing liquid leakage in a cap for medical use for which a plug body is a conventional roughly columnar shape and an elastomer resin is used as material. SOLUTION : The cap for the medical use comprises a roughly cylindrical plug body 1 having an upper bottom part 11, a lower bottom part 12 and a side face part 13 and an outer frame body 2 having a side peripheral part 21 for holding at least the side face part 13 of the plug body from a side face direction on the inner wall 211 and a bottom surface holding part 22 extended from the lower end of the side peripheral part in a circle center direction for holding the lower bottom part 12 of the plug body from a lower direction at the upper part 221, the plug body is a thermoplastic elastomer resin, and the outer frame body is synthetic resin. The lower bottom part 12 of the plug body and the upper part 221 of the bottom surface holding part of the outer frame body are fused with each other, and the side face part 13 of the plug body and the inner wall 211 of the side peripheral part of the outer frame body are in contact with each other in a non-fused state.