A lever lock-type male connector comprising a connector main body and a lock ring , wherein the connector main body includes a rod-shaped male luer and a lever that is connected to a base end portion of the male luer via a base , and the lever includes a locking portion that is disposed on the same side as the male luer relative to the base such that the locking portion opposes the male luer in a first direction (X), an operating portion that is disposed on the opposite side to the male luer relative to the base, and a locking claw that protrudes toward the male luer from a surface of the locking portion that is located on a side facing the male luer, characterised in that the lock ring is disposed opposing an inner surface of the operating portion in the first direction, the lock ring is movable between a first position at which the lock ring is located close to the base and a second position at which the lock ring is located away from the base, when the lock ring is at the first position, the lever is elastically pivotable such that the locking claw moves away from the male luer, when the lock ring is at the second position, the lock ring restricts the lever from pivoting such that the locking claw moves away from the male luer, the lock ring includes a rod that extends beyond the base toward the male luer, and the lever lock-type male connector is configured such that in a state in which the lock ring is at the first position, if a female connector is moved toward the base along a longitudinal direction of the male luer, at least a portion of the rod collides with the female connector, the lock ring is moved toward the second position by the female connector, and at the same time as the locking claw engages with the female connector, the lock ring reaches the second position. wherein the connector main body includes a rod-shaped male luer and a lever that is connected to a base end portion of the male luer via a base , and the lever includes a locking portion that is disposed on the same side as the male luer relative to the base such that the locking portion opposes the male luer in a first direction (X), an operating portion that is disposed on the opposite side to the male luer relative to the base, and a locking claw that protrudes toward the male luer from a surface of the locking portion that is located on a side facing the male luer, characterised in that the lock ring is disposed opposing an inner surface of the operating portion in the first direction, the lock ring is movable between a first position at which the lock ring is located close to the base and a second position at which the lock ring is located away from the base, when the lock ring is at the first position, the lever is elastically pivotable such that the locking claw moves away from the male luer, when the lock ring is at the second position, the lock ring restricts the lever from pivoting such that the locking claw moves away from the male luer, the lock ring includes a rod that extends beyond the base toward the male luer, and the lever lock-type male connector is configured such that in a state in which the lock ring is at the first position, if a female connector is moved toward the base along a longitudinal direction of the male luer, at least a portion of the rod collides with the female connector, the lock ring is moved toward the second position by the female connector, and at the same time as the locking claw engages with the female connector, the lock ring reaches the second position. <EOS>