The Sunflower Class (ひまわり) is a class of the Futaba Kindergarten handled by Midori Ishizaka. They are closely-knit and have camping trips and field trips together. A recurring theme is that the Sunflower class always have a competition with the Rose class whether it's Baseball, Soccer, or Trekking. In competitions (such as sports day) they usually always lose, except occasionally when Shin-chan manages to turn the situation around.
They had Shiizou Atsukuru as a temporarily teacher in training. When a new student arrives at the kindergarten, they are usually put it in another class, which could mean that the sunflower class is full.