To provide a pallet conveying mechanism capable of speedily circulating a pallet in a simple structure in an automobile assembling line, and the assembling line using such a pallet conveying mechanism.

This pallet conveying mechanism moves the pallet P reaching the terminal point 17b of a friction conveyer FC2 to the starting point 7a of a friction conveyer FC1 without direction change in the direction as it is. This pallet conveying mechanism comprises rollers 34 that are arranged along a main frame 31 installed so as to interconnect the friction conveyers FC1 and FC2 and have a flange part 34a for abutting them on the pallet P, and a driving mechanism 35 for driving the rollers 34.