A magnesium hot rolling method comprises a first rolling step performing reciprocal rolling of magnesium plates (M0, M1) between an upstream side heating furnace (2) arranged on the upstream side of a rolling machine (1) for heating the magnesium plates (M0, M1) and a downstream side heating furnace (3) arranged on the downstream side of the rolling machine (1) for heating the magnesium plates (M0, M1), and a second rolling step performing reciprocal rolling of the magnesium plates (M0, M1) while retaining heat in the upstream side and downstream side ends thereof between an upstream side heat retention device (5) for carrying/heat-retaining the heated magnesium plates (M0, M1) and a downstream side heat retention device (6) for carrying/heat-retaining the heated magnesium plates (M0, M1). According to the magnesium hot rolling apparatus of the present invention and the magnesium hot rolling method employing the apparatus, quality of a product can be prevented from deterioration due to temperature variation during hot rolling of a magnesium alloy.