A medical connector comprising: a first connection section that partitions a first passage; a second connection section that partitions a second passage communicating with the first passage (la); and a rotation control section that controls relative rotation of the first connection section and the second connection section in a connection state, wherein the second connection section includes a wall face that abuts on the first connection section to restrict the first connection section from moving in a direction to be separated from the second connection section along an axis extending over the first passage and the second passage, the rotation control section allows the second connection section to rotate relative to the first connection section in a first circumferential direction about the axis as a central axis and restricts the second connection section from rotating relative to the first connection section in a second circumferential direction opposite to the first circumferential direction, in a state where the first connection section abuts on the wall face, and the first connection section is connectable to a different medical device using a rotating operation in the second circumferential direction and is disconnectable from the different medical device using a rotating operation in the first circumferential direction, wherein an annular groove is formed on an outer wall of a first tubular portion of the first connection section, and the second connection section includes a claw portion that is located outside the first tubular portion in the radial direction and fits into the annular groove whereby the wall face is constituted by an outer wall of the claw portion, whereby the first connection section includes an annular support portion projecting radially outward from the inner first tubular portion, and an outer tubular portion projecting from the support portion, characterized in that the outer tubular portion covers the radially outer side of the claw portion. a first connection section that partitions a first passage; a second connection section that partitions a second passage communicating with the first passage (la); and a rotation control section that controls relative rotation of the first connection section and the second connection section in a connection state, wherein the second connection section includes a wall face that abuts on the first connection section to restrict the first connection section from moving in a direction to be separated from the second connection section along an axis extending over the first passage and the second passage, the rotation control section allows the second connection section to rotate relative to the first connection section in a first circumferential direction about the axis as a central axis and restricts the second connection section from rotating relative to the first connection section in a second circumferential direction opposite to the first circumferential direction, in a state where the first connection section abuts on the wall face, and the first connection section is connectable to a different medical device using a rotating operation in the second circumferential direction and is disconnectable from the different medical device using a rotating operation in the first circumferential direction, wherein an annular groove is formed on an outer wall of a first tubular portion of the first connection section, and the second connection section includes a claw portion that is located outside the first tubular portion in the radial direction and fits into the annular groove whereby the wall face is constituted by an outer wall of the claw portion, whereby the first connection section includes an annular support portion projecting radially outward from the inner first tubular portion, and an outer tubular portion projecting from the support portion, characterized in that the outer tubular portion covers the radially outer side of the claw portion.