The invention provides a calf massage unit which improves the massage effect with air bags and applies various massages. The unit is provided with a pair of left and right concave parts (21 and 21) for containing patient's calf, a side air bag (30) arranged on the side stretching upward from the base (22) of each concave part along the left and right direction. The side controls the expansion andthe shrinkage of the air bag to massage the calf. Wherein, the side air bag (30) compromises: a first air bag (31) arranged on a base side of the concave part side; and a second air bag (37) arrangedon an opening side of the concave part side. The first air bag massages the rear side of the calf from the calf side, and the second air bag massages the front side.