PURPOSE: A rice seedling planting machine for riding is provided to enable an operator to perform a spare seedling supply work easily by expanding space on movable steps. CONSTITUTION: A rice seedling planting machine for riding includes a seedling transplanter(10) installed at the rear of a driving machine, pivotal axes(28) embedded in right and left side parts of the front of the driving machine, and spare rice seedbed racks(12) which support the inside more than right and left centers. From the plane view, the right and left interval of the front part of the right and left spare rice seedbed racks is narrower than the right and left interval of the rear part of the right and left spare rice seedbed racks.
