To provide a vehicle door sealing device, which can attain optimum sealing of a door opening part without providing troublesome countermeasures for sealing, such as forming a sealing edge material at the door opening part, or a sealing suspending part on the door side.

A sealing material 15 consisting of a weatherstrip is formed at the lower edge part of the front door 5 of a cabin so as to be overhung outward, in a forklift provided with the cabin disposed at a more inward position than the vehicle body side face on a vehicle body, and whose floor surface is formed to be flush with the body upper surface. The sealing structure is formed so as to seal the clearance between the front door 5 and the floor surface 9 by press-pressuring the seal material 15 against the folded corner part of a rubber mat 22 affixed at the upper surface of a step plate 12 consisting a part of the floor surface 9 of the cabin when the door is closed.