PROBLEM TO BE SOLVED: To provide a locking device of 3-piece interlocking sliding doors which has excellent operability and reliability, and resistance to external attacks, in spite of the simple structure of the locking mechanism, and which allows the sliding doors to open/close in a smooth manner.;SOLUTION: An interlocking mechanism 5 is formed with a guide portion 11 that extends in the vertical direction along a side edge of an intermediate sliding door 2B in the closed state, the side edge being overlapped with a front side sliding door 2A and includes a movable body 12 that displays vertically while being restrained by the guide portion. One end of a first interlocking rod 13 and one end of a second interlocking rod 14 are respectively pivoted on a pivot 15 portion of the movable body, the other end of the first interlocking rod is pivotally supported by a first pivot portion 16 on a tip side of the front sliding door, and the other end of the second interlocking rod is pivotally supported by a second pivot portion 17 at a side edge of a rear sliding door 2C in the closed state which overlaps with the intermediate sliding door. A structure is configured in which, for restricting the rotation of the first interlocking rod around the first pivot portion in the vicinity of the first pivot portion, a locking member 18 is used that is driven through the locking operation of a locking device 4 provided at the end of the front sliding door on the door tip side.;SELECTED DRAWING: Figure 5;COPYRIGHT: (C)2019,JPO&INPIT
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