The purposes of this investigation were to grasp the special support needs of children in preschool children in A City. And the method of effective childcare support is examined. A total of 902 four or five-year-old class children (about 10% of four or five-year-old population) was investigated. Investigation was executed using a questionnaire interview and the facing interview. The child’s percentages which the teacher mentioned as "worrisome" were 25.1% of four- years-old and 26.2% of five- years-old children. Next, we classified the episode of the behavior "worrisome" for every behavioral trait. It was found out that 27.7% of four-year-old children and 28.8% of five-year-old ones were classified as children with special support needs. We guessed that the behavior trait similar to a developmental disorder which were affected by bringing-up and childcare environment and the true developmental disorder were intermingled. The child’s ratio to need support in the outside was 9.4% of four- years-old, 12.1% of five-years-old. In entering-school the children chose the special support class or instruction classroom were 5.3% of five-years-old children. We discussed the necessity for the improvement of the contents of childcare, and environment which does not actualize a developmental disorder.