Rotary atomizing head and rotary atomizing coating machine

A rotary atomizing coating machine comprising:

• a rotary atomizing head having an inner peripheral surface having:
• a diametrical expanded part diametrically expanded from a center of the rotary atomizing head to a peripheral edge;
• and a blocking member covering the center of the diametrical expanded part, such that centrifugal force generated by rotation is applied on paint supplied to the inner peripheral surface so as to discharge the paint outside atomizingly, wherein
• a single step part provided at a middle portion of the inner peripheral surface between paint supply holes, supplying paint to the inner peripheral surface, and the peripheral edge of the inner peripheral surface,
• the single step part comprising a step surface substantially perpendicular to a direction of centrifugal force applied on the paint supplied to the inner peripheral surface, and
• a distance between each of the paint supply holes and the step part being shorter than a distance between the step part and the peripheral edge,
• the step part provided between the paint supply holes disposed at the blocking member and a peripheral edge of the blocking member, and a distance between the step part and the paint supply holes is shorter than a distance between the step part and the peripheral edge of the blocking member, and
• an inner surface of the blocking member formed between the step part and the peripheral edge of the blocking member, and an inner surface of the diametrical expanded part, being configured as a continuous surface.