LOCK DEVICE FOR FOLDING DOOR

PROBLEM TO BE SOLVED: To provide a lock device preventing contact of a latch main body with a floor of a bathroom when a door is opened and closed even when a rail and the floor of the bathroom have the same height. SOLUTION: A latch case 40, a latch main body 50, and a member to be attached 60 constitute a latch 24, the member to be attached 60 is fixed on a frame 20 at a door tip of a first door 14, and the latch case 40 is energized upward by a spring 66 to bring the latch main body 50 above an upper end face 80a of a rail 80. An operation member 25 is attached to the frame 20 at a door tip of a second door 15, a cam 72 of this operation member 25 is brought into contact with a cam 49 of the latch case 40 at the time of a close attitude, and the latch case 40 is moved downward against the spring 66 to lock the latch main body 50 on the rail 80.