The invention concerns a slat conveyor in which the extension of the pitch due to the wear of a chain can be easily adjusted without performing the construction work required for conventional conveyors. In the conveyor, slat supporting members support slats adjacent to one another in a travelling direction. Each of the slat supporting members is provided with a first connection portion and a second connection portion for connecting the adjacent slat supporting members and the second connection portion of a succeeding slat supporting member overlaps the first connection portion of a preceding slat supporting member. Coupling shafts are provided, each with a first shaft portion engaged with the first connection portion and a second shaft portion engaged with the second connection portion; the first shaft portion and the second shaft portion are made eccentric from each other on two axes in parallel, and the coupling shaft serves to adjust the interval between the adjacent slats by rotation of its attaching position freely and joins the slat supporting members endlessly into a chain.