A lever (22) is formed with first driving portions (27) to move sliders (35) from a connection end position to an unlocking position in the process of rotating the lever (22) from a connection position to a switch position. Second driving portions (28) push the sliders (35) parallel to one another from the unlocking position to a connection start position in the process of rotating the lever (22) from the switch position to an initial position and move away from the sliders (35) as the lever (22) rotates from the initial position to the switch position with the sliders (35) located at the connection start position. Locking portions (33) restrict rotation of the lever (22) toward the connection position by being locked to the sliders (35) with the sliders (35) located at the connection start position and the lever (22) located at the switch position.