An optical connector system comprising: a first optical connector including a first ferrule and a first housing that houses the first ferrule ; and a second optical connector including a second ferrule to be connected to the first ferrule , a second inner housing that houses the second ferrule , and a second outer housing that houses the second inner housing , the second optical connector being attachable to and detachable from the first optical connector , wherein the first housing includes a latch reception part and a latch release part , and the latch reception part and the latch release part are provided on a first arm part extending toward the second optical connector along a direction of attaching and detaching of the first optical connector and the second optical connector, the second inner housing includes a front latch part configured to be latched to the latch reception part and a rear latch part configured to be latched to the second outer housing , and the rear latch part is provided on a second arm part extending toward the first optical connector along the direction of attaching and detaching, the rear latch part is suitable to be latched to the second outer housing before the first optical connector and the second optical connector are connected to each other, the latch release part is suitable to release a latch of the rear latch part by relatively moving the first optical connector and the second optical connector to a connection side, after the front latch part is latched to the latch reception part , the second outer housing includes a latch protrusion to be latched to the rear latch part , and after the latch of the latch protrusion and the rear latch part is released, the latch protrusion is suitable to be positioned to sandwich the latch reception part with the front latch part . a first optical connector including a first ferrule and a first housing that houses the first ferrule ; and a second optical connector including a second ferrule to be connected to the first ferrule , a second inner housing that houses the second ferrule , and a second outer housing that houses the second inner housing , the second optical connector being attachable to and detachable from the first optical connector , wherein the first housing includes a latch reception part and a latch release part , and the latch reception part and the latch release part are provided on a first arm part extending toward the second optical connector along a direction of attaching and detaching of the first optical connector and the second optical connector, the second inner housing includes a front latch part configured to be latched to the latch reception part and a rear latch part configured to be latched to the second outer housing , and the rear latch part is provided on a second arm part extending toward the first optical connector along the direction of attaching and detaching, the rear latch part is suitable to be latched to the second outer housing before the first optical connector and the second optical connector are connected to each other, the latch release part is suitable to release a latch of the rear latch part by relatively moving the first optical connector and the second optical connector to a connection side, after the front latch part is latched to the latch reception part , the second outer housing includes a latch protrusion to be latched to the rear latch part , and after the latch of the latch protrusion and the rear latch part is released, the latch protrusion is suitable to be positioned to sandwich the latch reception part with the front latch part . <EOS>