| 摘要 |
An adapter unit capable of preventing breakage of a positioning key for accurately connecting first and adapters. A key is formed on an inner peripheral surface of a hollow cylindrical portion of a receptacle adapter such that a front end thereof is rearward of a front end of the hollow cylindrical portion. Projecting portions are formed on the inner peripheral surface of the hollow cylindrical portion at locations away from the key in a circumferential direction, for receiving a front end of a hollow cylindrical portion of a plug adapter inserted into the hollow cylindrical portion of the receptacle adapter. Receiving portions are formed on an outer peripheral surface of the hollow cylindrical portion of the plug adapter, for receiving the projecting portions. The front end of the key is rearward of the front end of each projecting portion.
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