To provide a suction type traveling device having an entirely simple structure while the timing for vacuum changing is not deviated.

In the suction type traveling device, motion transmission elements 3, 5 are stretched between a pair of main sprockets 2, 4 provided on a device body 1 to constitute a crawler mechanism, and a plurality of suction pads P are connected to the motion transmission elements 3, 5, the insides of the suction pads are communicated with a vacuum source while the suction pads are brought into contact with a sucked face S. By maintaining the inside of the suction pads in a vacuum state, the device body travels with respect to the sucked face while maintaining the sucked state. An on-off valve mechanism V1 is individually provided on each suction pad P. The on-off valve mechanism V1 opens the valve by the force applied when the suction pad P is brought into contact with the sucked face S to communicate the suction pad P with the vacuum source. On the other hand, when the suction pad is not in contact with the sucked face S, the valve is opened to block the communication of the suction pad P with the vacuum source.