This connector is provided with: a connecting end portion to be connected to another connecting end portion of another connector; a tube which is attached to a proximal end side of the connecting end portion, and which allows a fluid to flow through the connecting end portion; and a cover portion which is fixed to the tube and covers the connecting end portion. The cover portion includes a first sheet and a second sheet which are provided at least in a zone at the distal end side of the connecting end portion and are bonded to one another. An adhesive agent capable of being repeatedly peeled and adhered is provided on each of a first reverse surface of the first sheet and a second reverse surface of the second sheet. The cover portion is hermetically sealed by the first reverse surface and the second reverse surface being bonded at the periphery of the connecting end portion by means of the adhesive agent, in a state in which the connecting end portion is disposed between the first sheet and the second sheet.