PROBLEM TO BE SOLVED: To provide a medical connector in which a first member and a second member can be easily connected.SOLUTION: A medical connector 2 comprises: a first member that consists of a first connector； and a second member that consists of a second connector or a second cap that is detachably connected to the first member. The first member comprises a first convex part, and the second member comprises a second convex part that can be engaged with the first convex part. When the second member is moved in a direction of a central axis of the first member with respect to the first member at the time of connection of the first member and the second member, the first convex part and the second convex part are engaged. When the second member is rotated by a predetermined amount around the central axis with respect to the first member at the time of removal of the second member from the first member, the engagement of the first convex part and the second convex part is released.
