To provide a workpiece movement positioning device capable of simultaneously fixing a plurality of workpiece clamps provided on a carriage to the carriage.

A carriage base 3 long in X-axis direction is provided movably in Y-axis direction, and an engaging part 15 to be relatively and movably engaged with engagement parts 13 provided on a clamp body 11 of a plurality of workpiece clamps 9 is provided long in X-axis direction on a carriage 5 which is movably provided on the carriage base 3 in X-axis direction. A fixing tool 17 capable of fixing the engagement parts 13 in an immobile state at the same time is provided on the engaging part 15. The engagement part 13 provided on the clamp body 11 of each workpiece clamp 9 is a groove part in X-axis direction. The engaging part 15 provided on the carriage 5 has an upper bracing member 21U and a lower bracing member 21L for bracing the groove part in the vertical direction which are long in X-axis direction while at least one of the upper bracing member 21U and the lower bracing member 21L is vertically movable.