The rate of young people in bicycle accidents is dominant not only in casualties but also in violator against the traffic law.　This paper aims to figure the cycling behaviors of junior and senior high school students, referring to their general traffic experiences, their knowledge of traffic law on bicycle and their behaviors in daily life.　A questionnaire survey was conducted in Shiga prefecture and total of 1,218 junior high school and 1,096 high school students of both sex answered the questionnaire.　The results showed that their understanding of traffic law was not sufficiently correct and that corresponded to their risky cycling behaviors, inadequate general traffic behaviors and their socially undesirable behaviors in daily life.　Based on these results, the necessity of education for the accurate traffic law and nourishment of sociality in daily life for the young people are suggested.