In this research, I had for my object to consider the concept of rhythm of the Courses of Study, to settle the various confusion around the Rhythm Dance, focusing on "Expressive Activity (elementary school) and Dance (secondary school)". Rhythm of the present Course of Study is used in the running long jump and running high jump etc., and I can think those are used as some orders of the movement. On the other hand, rhythm used as music (or, the musical genre) of rock, samba and hip hop in "Expressive Activity and Dance". And there are examples which catch "rock music" as "lock dance". Thus there is various confusion about the concept of rhythm and "Rhythm Dance" in "Expressive Activity and Dance". To settle that，it's necessary to reconsider the concept of rhythm in "Expressive Activity and Dance" made with movement of a body．And it's also necessary to specify about a relation between "Expression and Creative Dance" and "Rhythm Dance and Contemporary Rhythmic Dance".