Endoscope apparatus 1 includes:: endoscope 20 The first optical conenctor of connector 51, from plug portion serve 41 The part 31 of first socket 71 and socket 76 enters the first optical connector 51 and is inserted into The part 31 of second socket 72 and container 77 enters the first optical connector 52 and is inserted into One kind is erroneously inserted when component 74 being prevented to be partially located at the movement of the second socket 72 and 77, is inconjunction with the first optical connector 51 of insertion and is entered the first socket 71 and 76, arrives retracted position, be inserted into the second insertion hole 72 and 77 in the second optical conenctor 52 Component 74 is prevented to be inserted into the second socket 72 and 77 in the first optical connector 51 with being erroneously inserted for contacting with contact 78.
