A rowing boat footrest assembly is provided with a base, an attachment structure, a limit structure and an adjustment structure. The attachment structure is coupled to the base, and configured and arranged to support a cleat. The limit structure limits a movement of the cleat to a first movement range in a transverse direction with respect to a longitudinal boat direction. The adjustment structure is provided at a location such that the adjustment structure adjusts the first movement range to a second movement range that is smaller than the first movement range.