Shaft supporting unit and manufacturing method thereof

A method for manufacturing first and second shaft supporting units, each of the first and second shaft supporting units to be used for supporting a shaft of a pivoting body with a capacity of pivot movement and comprising a lower block having a lower recess with a semicircular column shape, and configured to support the shaft from beneath, a lower bush having a semi-cylindrical shape, located in the lower recess, and configured to have the shaft slide thereon, and an upper block covering above the shaft, the upper block having an upper recess with a predetermined gap between the upper recess and the shaft, each of the first and second shaft supporting units not abutting an upper side of the shaft when the pivoting body pivots, the method comprising:

• making a lower face of a first block contact with a lower face of a second block, and fixing the first block to the second block to form a workpiece block;
• forming a penetrating hole with a column shape to the workpiece block, so as to form the upper recess to each of the first and second blocks;
• and
• using the first block as the upper block of the first shaft supporting unit, and using the second block as the upper block of the second shaft supporting unit, so as to manufacture the first and second shaft supporting units.