To provide a connection device in a traveling device capable of reliably performing connection even on a curved track.

In the connection device of the traveling device comprising a drive traveling device 1 to travel on a track, and a driven traveling device 2 connected to the drive traveling device 1, the drive traveling device 1 comprises drive side connection means 5, 5a, 7 to be connected to a driving device, a turn connection device 20 which is provided on ends of the connection means to be connected to a driven side connection means, and a spring means 19 to correct the turning direction of the turn connection device 20 to the traveling direction of the traveling device. The driven traveling device 2 comprises a driven side connection means 5a to be connected to the driven traveling device 2, a turn connection device 21 which is provided on an end of the connection means to be connected to the drive side connection means, and a spring means 19 to correct the turning direction of the turn connection device 21 to the traveling direction of the traveling device.